CN107994540A - A kind of soft start protection power source circuit - Google Patents
A kind of soft start protection power source circuit Download PDFInfo
- Publication number
- CN107994540A CN107994540A CN201711310103.8A CN201711310103A CN107994540A CN 107994540 A CN107994540 A CN 107994540A CN 201711310103 A CN201711310103 A CN 201711310103A CN 107994540 A CN107994540 A CN 107994540A
- Authority
- CN
- China
- Prior art keywords
- triode
- poles
- collector
- emitter
- resistance
- 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
Links
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
Abstract
The invention discloses a kind of soft start protection power source circuit; include the transformer T1 of input termination 220V alternating currents; the diode bridge rectifier D1 being connected with input terminal with the output terminal of transformer T1; the overvoltage crowbar being connected with diode bridge rectification D1, and the soft starting circuit being connected with overvoltage crowbar.The present invention provides a kind of soft start protection power source circuit; raising that can be progressively in power supply is to the powering quantity of electrical appliance; the impact that power supply powers electrical appliance when not only reducing startup well; the impact that each component is subject to inside circuit is also reduced well, has reached the effect of protection circuit and electrical appliance well.
Description
Technical field
The present invention relates to electronic field, in particular to a kind of soft start protection power source circuit.
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
A component causes larger load.And now the major way of the rush of current of suppression 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 the above problem, there is provided a kind of soft start protection power source circuit, can in power supply
Raising progressively is to the powering quantity of electrical appliance, the impact that power supply powers electrical appliance when not only reducing startup well, also
The impact that each component is subject to inside circuit is reduced well, has reached the effect of protection circuit and electrical appliance well.
The purpose of the present invention is achieved through the following technical solutions：
A kind of soft start protection power source circuit, include input termination 220V alternating currents transformer T1, with input terminal with
The diode bridge rectifier D1 that the output terminal of transformer T1 is connected, the overvoltage protection being connected with diode bridge rectification D1
Circuit, and the soft starting circuit being connected with overvoltage crowbar.
Further, the overvoltage crowbar is by unidirectional thyristor Q5, and cathode is through fuse F1, anode and unidirectional brilliant lock
Polar capacitor C2, the P pole that the N poles of pipe Q5 are connected is connected with the control pole of unidirectional thyristor Q5, N poles after resistance R7 with list
The zener diode D3 being connected to the P poles of thyristor Q5, and one end is connected with the N poles of zener diode D3, the other end
The resistance R12 compositions being connected with the N poles of unidirectional thyristor Q5；Wherein, the cathode of polar capacitor C2 and diode bridge rectification
The positive output end of device D1 is connected, and the anode of polar capacitor C2 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 cathode is connected after diode D4 with the emitter of triode Q1, anode is connected with the emitter of triode Q9
Property capacitance C3, the resistance R1 being serially connected between the emitter and collector of triode Q1, one end is connected with the base stage of triode Q4
Connect, the resistance R11 that the other end is connected with the collector of triode Q9, one end is connected with the collector of triode Q1, is another
Capacitance C1, the P pole that is connected with the base stage of triode Q6 is held to be connected with the base stage of triode Q6, the hair of N poles and triode Q6
The diode D5 that emitter-base bandgap grading is connected, one end is connected with the collector of triode Q6, the collector phase of the other end and triode Q7
The resistance R8 of connection, the electricity that one end is connected with the collector of triode Q1, the other end is connected with the emitter of triode Q7
Hinder R3, the zener diode D6 that P poles are connected with the emitter of triode Q7, N poles are connected with the N poles of diode D5, one end
It is connected after resistance R4 with the collector of triode Q1, the other end is extremely connected after resistance R13 with the N of zener diode D6
Connect, the variable resistor R9 that sliding end is connected with the base stage of triode Q7, and cathode be connected with the collector of triode Q1,
The polar capacitor C4 compositions that anode is connected with the N poles of zener diode D6；Wherein, the base stage of triode Q1 is with triode Q4's
Emitter is connected, and the collector of triode Q1 is connected with the collector of triode Q4, the P poles of diode D4 while and polarity
The cathode of capacitance C3 is connected with the P poles of unidirectional thyristor Q5, and polar capacitor C3 is connected with the N poles of unidirectional thyristor Q5, and three
The emitter of pole pipe Q9 is connected and is grounded with the emitter of triode Q6, the base stage of triode Q9 and the collector of triode Q6
It is connected, the positive electrode and negative electrode of polar capacitor C4 form the power output end of the soft starting circuit.
Compared with prior art, the present invention haing the following advantages and beneficial effect：
(1) overvoltage crowbar of the invention can timely blow fuse when circuit is over-pressed, after reaching protection
The purpose of continuous circuit, greatly improves the security and stability of circuit operation, to follow-up first device when reducing overtension
The damage of part, thereby reduces the use and maintenance 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 achieveed the purpose that 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.
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 soft start protection power source circuit, includes the transformer T1 that input terminates 220V alternating currents, with
The diode bridge rectifier D1 that input terminal is connected with the output terminal of transformer T1, is connected with diode bridge rectification D1
Overvoltage crowbar, and the soft starting circuit being connected with overvoltage crowbar.
The overvoltage crowbar is by unidirectional thyristor Q5, fuse F1, polar capacitor C2, zener diode D3, resistance
R7, and resistance R12.
During connection, the cathode of polar capacitor C2 is connected through fuse F1, anode with the N poles of unidirectional thyristor Q5, voltage stabilizing
The P poles of diode D3 are connected with the control pole of unidirectional thyristor Q5, P pole phase of the N poles after resistance R7 with unidirectional thyristor Q5
Connection, one end of resistance R12 is connected with the N poles of zener diode D3, the other end is connected with the N poles of unidirectional thyristor Q5.
Wherein, the cathode of polar capacitor C2 is connected with the positive output end of diode bridge rectifier D1, polar capacitor C2
Anode 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 zener 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, zener diode D6, polar capacitor C3, capacitance C1, acute capacitance C4, resistance R11, resistance R8, resistance R1,
Resistance R3, resistance R4, resistance R13, and variable resistor R9.
During connection, the cathode of polar capacitor C3 is connected after diode D4 with the emitter of triode Q1, anode and three
The emitter of pole pipe Q9 is connected, and resistance R1 is serially connected between the emitter and collector of triode Q1, one end of resistance R11 with
The base stage of triode Q4 is connected, the other end is connected with the collector of triode Q9, and one end of capacitance C1 is with triode Q1's
Collector is connected, the other end is connected with the base stage of triode Q6, and the P poles of diode D5 are connected with the base stage of triode Q6
Connect, N poles are connected with the emitter of triode Q6, one end of resistance R8 is connected with the collector of triode Q6, the other end with
The collector of triode Q7 is connected, and one end of resistance R3 is connected with the collector of triode Q1, the other end and triode Q7
Emitter be connected, the P poles of zener diode D6 are connected with the emitter of triode Q7, N poles and the N poles phase of diode D5
Connection, one end of variable resistor R9 is connected after resistance R4 with the collector of triode Q1, the other end after resistance R13 with it is steady
The N poles of pressure diode D6 are connected, sliding end is connected with the base stage of triode Q7, cathode and the triode Q1 of polar capacitor C4
Collector be connected, anode is connected with the N poles of zener diode D6.
Wherein, the base stage of triode Q1 is connected with the emitter of triode Q4, the collector and triode of triode Q1
The collector of Q4 is connected, and the P poles of diode D4 are extremely connected with the cathode of polar capacitor C3 and the P of unidirectional thyristor Q5 at the same time
Connect, polar capacitor C3 is connected with the N poles of unidirectional thyristor Q5, and the emitter of triode Q9 is connected with the emitter of triode Q6
Connect and be grounded, the base stage of triode Q9 is connected with the collector of triode Q6, and the positive electrode and negative electrode composition of polar capacitor C4 should
The power output end of soft starting circuit.
By resistance R1 and capacitance C1 values, soft start delay time can obtain.When energized, circuit passes through resistance R1 and two
Pole pipe D5 charges capacitance C1, charge constant t=R*C, when fully charged so that and triode Q6 is turned on, so that
Triode Q9 is turned on, finally so that triode Q1 and triode Q4 is turned on, so as to achieve the purpose that soft start.
As described above, the present invention can be realized well.
Claims (3)
- A kind of 1. soft start protection power source circuit, it is characterised in that：Include the transformer T1 of input termination 220V alternating currents, it is and defeated Enter the diode bridge rectifier D1 that end is connected with the output terminal of transformer T1, be connected with diode bridge rectification D1 Overvoltage crowbar, and the soft starting circuit being connected with overvoltage crowbar.
- A kind of 2. soft start protection power source circuit according to claim 1, it is characterised in that：The overvoltage crowbar by Unidirectional thyristor Q5, polar capacitor C2, the P pole and list that cathode is connected through fuse F1, anode with the N poles of unidirectional thyristor Q5 It is connected to the control pole of thyristor Q5, the zener diode that N poles are connected after resistance R7 with the P poles of unidirectional thyristor Q5 D3, and the resistance R12 that one end is connected with the N poles of zener diode D3, the other end is connected with the N poles of unidirectional thyristor Q5 Composition；Wherein, the cathode of polar capacitor C2 is connected with the positive output end of diode bridge rectifier D1, and polar capacitor C2's is negative Pole is connected with diode bridge rectifier D1 negative output terminals.
- A kind of 3. soft start protection power source circuit according to claim 2, it is characterised in that：The soft starting circuit is by three Pole pipe Q1, triode Q4, triode Q9, triode Q6, triode Q7, emitter of the cathode after diode D4 with triode Q1 It is connected, the polar capacitor C3 that anode is connected with the emitter of triode Q9, is serially connected in the emitter and current collection of triode Q1 Resistance R1 between pole, the electricity that one end is connected with the base stage of triode Q4, the other end is connected with the collector of triode Q9 Hinder R11, one end is connected with the collector of triode Q1, the other end is connected with the base stage of triode Q6 capacitance C1, P pole and The diode D5 that the base stage of triode Q6 is connected, N poles are connected with the emitter of triode Q6, one end and the collection of triode Q6 The resistance R8 that electrode is connected, the other end is connected with the collector of triode Q7, one end are connected with the collector of triode Q1 Connect, resistance R3, the P pole that the other end is connected with the emitter of triode Q7 is connected with the emitter of triode Q7, N poles and two The zener diode D6 that the N poles of pole pipe D5 are connected, one end is connected after resistance R4 with the collector of triode Q1, the other end It is connected after resistance R13 with the N poles of zener diode D6, the variable resistor that sliding end is connected with the base stage of triode Q7 R9, and the polar capacitor C4 that cathode is connected with the collector of triode Q1, anode is connected with the N poles of zener diode D6 Composition；Wherein, the base stage of triode Q1 is connected with the emitter of triode Q4, and the collector of triode Q1 is with triode Q4's Collector is connected, and the P poles of diode D4 are connected with the cathode of polar capacitor C3 and the P poles of unidirectional thyristor Q5 at the same time, pole Property capacitance C3 is connected with the N poles of unidirectional thyristor Q5, the emitter of triode Q9 be connected with the emitter of triode Q6 and Ground connection, the base stage of triode Q9 is connected with the collector of triode Q6, and the positive electrode and negative electrode of polar capacitor C4 form this and soft open The power output end of dynamic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310103.8A CN107994540A (en) | 2017-12-11 | 2017-12-11 | A kind of soft start protection power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310103.8A CN107994540A (en) | 2017-12-11 | 2017-12-11 | A kind of soft start protection power source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107994540A true CN107994540A (en) | 2018-05-04 |
Family
ID=62037427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711310103.8A Pending CN107994540A (en) | 2017-12-11 | 2017-12-11 | A kind of soft start protection power source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107994540A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971111A (en) * | 2019-11-14 | 2020-04-07 | 中电科仪器仪表(安徽)有限公司 | Pulse width modulator auxiliary power supply circuit |
-
2017
- 2017-12-11 CN CN201711310103.8A patent/CN107994540A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971111A (en) * | 2019-11-14 | 2020-04-07 | 中电科仪器仪表(安徽)有限公司 | Pulse width modulator auxiliary power supply circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104753328B (en) | The current limliting high-voltage starting circuit of ultra-wide input voltage switch power supply | |
| CN202696486U (en) | 5-volt (V) voltage-stabilized power supply with protecting function | |
| CN204068199U (en) | A kind of under-voltage surge current protection circuit | |
| CN103427621B (en) | A kind of mining isolated intrinsic safety LED drive power | |
| CN107994540A (en) | A kind of soft start protection power source circuit | |
| CN104917431A (en) | Broad pulse trigger type DC speed regulating system with overvoltage and overcurrent protection | |
| CN111864698A (en) | Overvoltage protection circuit and method for synchronous generator rotor | |
| CN203708099U (en) | Current-limiting high-voltage startup circuit for switching power supply with ultra-wide input voltage range | |
| CN202696489U (en) | 5 V stabilized voltage supply with protection function | |
| CN205544984U (en) | Power supply unit with wide developments input adaptability | |
| CN208890677U (en) | A kind of automobile high power rectification circuit | |
| CN102780203A (en) | Overvoltage and under-voltage protection circuit | |
| CN107645180A (en) | A kind of low starting current power-supply circuit for cable monitoring | |
| CN107863750A (en) | A kind of double protection power source circuits of soft start | |
| CN202696110U (en) | Overvoltage and under-voltage protection circuit | |
| CN206922644U (en) | A kind of anti-firing circuit of Switching Power Supply and Switching Power Supply | |
| CN107911014A (en) | A kind of voltage protection formula soft start power circuit | |
| CN107947559A (en) | A kind of self-shield soft start power circuit | |
| CN204794034U (en) | Input undervoltage protection circuit | |
| KR101171739B1 (en) | A switch power source cycle by cycle overvoltage protection circuit | |
| CN206341455U (en) | LED drive chip and drive circuit | |
| CN105429120A (en) | Surge current suppression circuit | |
| CN218276132U (en) | OVP high-side overvoltage protection circuit | |
| CN203027133U (en) | Starting circuit based on quasi-resonance controller | |
| CN204145287U (en) | A kind of protective circuit of switch power source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180504 |