CN104426137A - Over-voltage protection circuit of single-stage PFC circuit MOS tube - Google Patents
Over-voltage protection circuit of single-stage PFC circuit MOS tube Download PDFInfo
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Abstract
The invention relates to an over-voltage protection circuit of a single-stage PFC circuit MOS tube. The over-voltage protection circuit is composed of a comparator, a controlled electronic switch, a sampling circuit, a sampling input terminal connected with an anode of a filter capacitor of a PFC circuit, and a protection output terminal connected with a main MOS tube grid electrode of a PFC circuit flyback circuit. A first input terminal of the comparator is connected with a sampling input terminal by the sampling circuit; a reference comparison voltage is inputted into a second input terminal of the comparator; and an output terminal of the comparator is connected with a control terminal of the controlled electronic switch. A cathode of the controlled electronic switch is grounded and an anode is connected with the protection output terminal. With the over-voltage protection circuit, an abnormal high-voltage situation after PFC circuit rectification can be detected and a main MOS tube of the flyback circuit of the PFC circuit can be disconnected timely, thereby effectively preventing the high-voltage breakdown and improving the circuit stable performance. Meanwhile, the main MOS tube does not need to use an expensive high voltage-withstanding tube, thereby substantially lowering the circuit cost.
Description
Technical field
The present invention relates to single-stage PFC technology, be specifically related to single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar.
Background technology
Due to single-stage PFC structure simple circuit compared with traditional switch power supply, circuit cost can be reduced without the need to the large electrochemical capacitor of high pressure after major advantage shows as commercial power rectification and can realize reducing the advantage of power volume, circuit self has the function of power factor correction simultaneously, drives industry in view of this circuit structure of these advantages is widely used in LED illumination.
Also exist while single-stage PFC structural advantages and lack limit, when input AC switch is in sparking state or fast open shutdown, one is only had compared with the thin-film capacitor of low capacity owing to there is no the energy storage electrolytic capacitor filter of larger capacity after rectification, extremely easily can produce LC resonance with the PCB lead-in inductance of input EMI inductance or importation, evoke very high due to voltage spikes, verify after tested be input as exchange as 230V time, direct voltage when resonance phenomena appears in fast open shutdown after rectifier bridge can up to about 600V and cycle time at tens milliseconds.If this phenomenon occurs, in circuit of reversed excitation, the drain-source voltage of main MOS equals input peak voltage 600V, add that the reflected voltage of transformer secondary output part is conventional at about 100V, the leakage inductance peak voltage of adding several ten points of V certainly will exceed the consequence that bombing appears in its rated value generation snowslide.Equally, also there is the same problem in single-stage PFC structure in antisurge with thunderbolt.In order to prevent the superpotential phenomenon of above-mentioned metal-oxide-semiconductor, and the expensive high withstand voltage metal-oxide-semiconductor of more than 800V of having to use, or using the metal-oxide-semiconductor that resistance to electric current is larger, the avalanche energy of corresponding raising pipe deals with over-voltage breakdown problem.
Summary of the invention
Not enough for above-mentioned prior art; the technical problem to be solved in the present invention is to provide a kind of metal-oxide-semiconductor overvoltage crowbar being applied to single-stage PFC; overvoltage protection is carried out to the metal-oxide-semiconductor in circuit of reversed excitation; make metal-oxide-semiconductor can without the need to selecting expensive high pressure pipe; thus reduce the cost of circuit; and the components and parts of available protecting circuit, improve circuit stability.
For solving the problems of the technologies described above, the technical solution used in the present invention is, single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar, is characterized in that: comprise comparator, controlled electronic switch, sample circuit, for the sampling input that is connected with the filter capacitor positive pole of pfc circuit and the protection output for being connected with the main metal-oxide-semiconductor grid of pfc circuit circuit of reversed excitation; The first input end of comparator is connected with sampling input by sample circuit, the second input input reference comparative voltage of comparator, and the output of comparator is connected with the control end of controlled electronic switch; The minus earth of controlled electronic switch, anode is connected with protection output.
Further technical scheme is, described controlled electronic switch is MOS switching tube, and described negative electrode is the source electrode of MOS switching tube, and described anode is the drain electrode of MOS switching tube, and described control end is the grid of MOS switching tube; The positive input terminal of described comparator is connected with sampling input by sample circuit, the negative input end input reference comparative voltage of comparator.
Further technical scheme is, described sample circuit comprises the first resistance, the second resistance and input resistance, and one end of the first resistance is connected with sampling input, and the other end of the first resistance is connected with one end of the second resistance, the other end ground connection of the second resistance; First resistance is connected with the positive input terminal of comparator by input resistance with the node of the second resistance; The output of comparator is also connected with the anode of diode D1, and the negative electrode of diode D1 is connected with the positive input terminal of comparator by feedback resistance.
Further technical scheme is, sampling input is also connected with the negative input end of comparator by the 3rd resistance, the second input resistance successively, 3rd resistance is connected with the negative electrode of three-terminal voltage-stabilizing pipe with the node of the second input resistance, the negative electrode of three-terminal voltage-stabilizing pipe also with reference to pole is connected, the plus earth of three-terminal voltage-stabilizing pipe.
Preferably, described sampling input is also connected with the positive power source terminal of comparator by the 4th resistance, the negative power end ground connection of comparator; The positive supply of comparator is also connected with the negative electrode of voltage stabilizing didoe, and the negative electrode of voltage stabilizing didoe also passes through ground capacity ground connection, the plus earth of voltage stabilizing didoe.
Preferably, also input capacitance is connected with between the positive input terminal of comparator and negative input end.
Preferably, the output of comparator is also connected with the positive supply of comparator by the 5th resistance, and the output of comparator is connected with the anode of diode D3A, and the negative electrode of diode D3A is connected by the grid of output resistance with MOS switching tube; The grid of MOS switching tube is also by the 6th grounding through resistance.
Preferably, described MOS switching tube is also connected with protection output by diode D6A, and the negative electrode of diode D6A is connected to the drain electrode of MOS switching tube, and the anode of diode D6A is connected to protection output.
Preferably, described comparator is high-speed comparator.
Single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar of the present invention can detect the abnormal pressure situation after pfc circuit rectification; the main metal-oxide-semiconductor of circuit of reversed excitation in timely disconnection pfc circuit; effectively prevent high-voltage breakdown; improve circuit stability performance; main metal-oxide-semiconductor being made simultaneously without the need to adopting expensive high pressure pipe, greatly reducing circuit cost.
Accompanying drawing explanation
Fig. 1 is single-stage PFC circuit.
Fig. 2 is single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Be single-stage PFC circuit shown in Fig. 1, comprise filter rectifier, driver output circuit and circuit of reversed excitation.
Single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar of the present invention, for being connected with the single-stage PFC circuit shown in Fig. 1, reaches overvoltage protection effect.As shown in Figure 2, single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar of the present invention, comprise comparator U3B, MOS switching tube Q1A as controlled electronic switch, sample circuit, for the sampling input HV that is connected with the filter capacitor C5 positive pole of pfc circuit and the protection output GD for being connected with the grid of the main metal-oxide-semiconductor Q3 of pfc circuit circuit of reversed excitation; The high-speed comparator of described comparator U3B to be model be TLV3202.The positive input terminal of comparator U3B is connected with sampling input HV by sample circuit, the negative input end of comparator U3B is used for input reference comparative voltage, be specially, described sample circuit comprises the first resistance, the second resistance and input resistance, in the present embodiment, the first resistance is the series arm of resistance R7A, resistance R8A and the resistance R9A connected successively, second resistance is resistance R20A, and input resistance is resistance R15A.Resistance R7A is connected with sampling input HV, and resistance R9A is connected with one end of resistance R20A, the other end ground connection of resistance R20A; Resistance R9A is connected with the positive input terminal of comparator U3B by the resistance R15A as input resistance with the node of resistance R20A; The output of comparator U3B is also connected with the anode of diode D1, and the negative electrode of diode D1 is connected with the positive input terminal of comparator U3B by feedback resistance R10A.Diode D1 and resistance R10A provides return difference to regulate for comparator U3B, prevents comparator from producing vibration when operating point.The resistance of resistance R7A, resistance R8A, resistance R9A is 560K Ω, and the resistance of resistance R20A is 10K Ω, and the resistance of resistance R15A is 1K Ω, and the resistance of resistance R10A is 300K Ω, and diode D1 selects model to be IN4448.
Sampling input HV is also connected with the negative input end of comparator U3B by the 3rd resistance, the second input resistance R14A successively, and wherein said 3rd resistance is the resistance R4A, resistance R5A and the resistance R6A that connect successively; Resistance R6A is connected with the negative electrode of three-terminal voltage-stabilizing pipe U2A with the node of the second input resistance R14A, and the negative electrode of three-terminal voltage-stabilizing pipe U2A also with reference to pole is connected, the plus earth of three-terminal voltage-stabilizing pipe U2A.Also input capacitance C1A is connected with between the positive input terminal of comparator U3B and negative input end.Resistance R4A, resistance R5A, resistance R6A and three-terminal voltage-stabilizing pipe U2A guarantee that the negative input end of comparator U3B can obtain stable reference voltage, ensure the normal realization of circuit function.Wherein, the resistance of resistance R4A, resistance R5A, resistance R6A is 330K Ω, and the resistance of resistance R14A is 1K Ω, and three-terminal voltage-stabilizing pipe U2A selects model to be TL431.
Described sampling input HV is also connected with the positive power source terminal of comparator U3B by the 4th resistance, and described 4th resistance is the resistance R1A, resistance R2A and the resistance R3A that connect successively, the negative power end ground connection of comparator U3B; The positive supply of comparator U3B is also connected with the negative electrode of voltage stabilizing didoe ZD1A, and the negative electrode of voltage stabilizing didoe ZD1A also passes through ground capacity C3A ground connection, the plus earth of voltage stabilizing didoe ZD1A.The effect of resistance R1A, resistance R2A, resistance R3A, electric capacity C3A and voltage stabilizing didoe ZD1A makes comparator U3B obtain stable operating voltage.Wherein, the resistance of resistance R1A, resistance R2A and resistance R3A is 240K Ω, and electric capacity C3A selects 104 electric capacity, and voltage stabilizing didoe ZD1A selects 5.1V.
The source ground of MOS switching tube Q1A, drain electrode is connected with protection output GD, and grid is connected with the output of comparator U3B; The output being specially comparator U3B is also connected with the positive supply of comparator U3B by the 5th resistance R12A, the output of comparator U3B is connected with the anode of diode D3A, and the negative electrode of diode D3A is connected with the grid of MOS switching tube Q1A by output resistance R18A; The grid of MOS switching tube Q1A is also by the 6th resistance R21A ground connection; The negative electrode of diode D6A is connected to the drain electrode of MOS switching tube Q1A, and the anode of diode D6A is connected to protection output GD; Resistance R12A, resistance R18A, resistance R21A, diode D3A, diode D6A form protective circuit.Wherein, resistance R12A selects resistance to be 150K Ω, and the resistance of resistance R18A is 1K Ω, and the resistance of resistance R21A is 200K Ω, and diode D3A selects model to be SM4007, and the model that diode D6A selects is IN4148.
Operation principle: as Fig. 1, when input AC switch is in sparking state or fast open shutdown, when inrush current impacts or inputs indirect lightning strike, after rectifier bridge, electric capacity C5 can produce LC resonance with the PCB lead-in inductance of input EMI inductance L 1, EMI inductance L 2 or importation, causes electric capacity C5 to exceed normal voltage resonance to a maximum.
When there is input power circuit resonance, namely when electric capacity C5 voltage exceeds testing circuit preset value, as shown in Figure 2, electric capacity C5 abnormal voltage is through sample circuit, formed at the positive input terminal (the 5th pin) of high-speed comparator U3B and enter to hold the voltage of reference voltage 2.5V (being using the builtin voltage 2.5V of three-terminal voltage-stabilizing pipe U2A as benchmark in the present embodiment) higher than reverse pumping, now comparator U3B in nanosecond rank fast upset become high level from low level, the grid of MOS switching tube Q1A connects high level and makes MOS switching tube Q1A conducting.Protection output GD becomes low level; namely in Fig. 1, the driving of main metal-oxide-semiconductor Q3 is forced to drag down, turn off; circuit of reversed excitation quits work; the peak voltage that secondary reflected voltage and transformer leakage inductance produce is zero remaining voltage of abnormal power supply; thus reduce main metal-oxide-semiconductor Q3 drain electrode and the voltage stress of source electrode, reach protection object.Because main metal-oxide-semiconductor can obtain effective overvoltage protection; making when the single-stage PFC circuit shown in construction drawing 1, without the need to selecting the expensive withstand voltage metal-oxide-semiconductor of height again, and selecting the metal-oxide-semiconductor of the conventional voltage of resistance to 650V; greatly reduce production cost, and improve the stability of circuit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar, is characterized in that: comprise comparator, controlled electronic switch, sample circuit, for the sampling input that is connected with the filter capacitor positive pole of pfc circuit and the protection output for being connected with the main metal-oxide-semiconductor grid of pfc circuit circuit of reversed excitation; The first input end of comparator is connected with sampling input by sample circuit, the second input input reference comparative voltage of comparator, and the output of comparator is connected with the control end of controlled electronic switch; The minus earth of controlled electronic switch, anode is connected with protection output.
2. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 1, it is characterized in that: described controlled electronic switch is MOS switching tube, described negative electrode is the source electrode of MOS switching tube, and described anode is the drain electrode of MOS switching tube, and described control end is the grid of MOS switching tube; The positive input terminal of described comparator is connected with sampling input by sample circuit, the negative input end input reference comparative voltage of comparator.
3. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 2, it is characterized in that: described sample circuit comprises the first resistance, the second resistance and input resistance, one end of first resistance is connected with sampling input, the other end of the first resistance is connected with one end of the second resistance, the other end ground connection of the second resistance; First resistance is connected with the positive input terminal of comparator by input resistance with the node of the second resistance; The output of comparator is also connected with the anode of diode D1, and the negative electrode of diode D1 is connected with the positive input terminal of comparator by feedback resistance.
4. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 3; it is characterized in that: sampling input is also connected with the negative input end of comparator by the 3rd resistance, the second input resistance successively; 3rd resistance is connected with the negative electrode of three-terminal voltage-stabilizing pipe with the node of the second input resistance; the negative electrode of three-terminal voltage-stabilizing pipe also with reference to pole is connected, the plus earth of three-terminal voltage-stabilizing pipe.
5. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 4, is characterized in that: described sampling input is also connected with the positive power source terminal of comparator by the 4th resistance, the negative power end ground connection of comparator; The positive supply of comparator is also connected with the negative electrode of voltage stabilizing didoe, and the negative electrode of voltage stabilizing didoe also passes through ground capacity ground connection, the plus earth of voltage stabilizing didoe.
6. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 4, is characterized in that: be also connected with input capacitance between the positive input terminal of comparator and negative input end.
7. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 4, it is characterized in that: the output of comparator is also connected with the positive supply of comparator by the 5th resistance, the output of comparator is connected with the anode of diode D3A, and the negative electrode of diode D3A is connected by the grid of output resistance with MOS switching tube; The grid of MOS switching tube is also by the 6th grounding through resistance.
8. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 7; it is characterized in that: described MOS switching tube is also connected with protection output by diode D6A; the negative electrode of diode D6A is connected to the drain electrode of MOS switching tube, and the anode of diode D6A is connected to protection output.
9. single-stage PFC circuit metal-oxide-semiconductor overvoltage crowbar according to claim 1, it is characterized in that, described comparator is high-speed comparator.
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| CN201310375786.0A CN104426137B (en) | 2013-08-26 | 2013-08-26 | Single- stage PFC circuit metal-oxide-semiconductor overvoltage crowbar |
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| CN201310375786.0A CN104426137B (en) | 2013-08-26 | 2013-08-26 | Single- stage PFC circuit metal-oxide-semiconductor overvoltage crowbar |
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| CN104426137B CN104426137B (en) | 2017-11-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854811A (en) * | 2018-08-21 | 2020-02-28 | 南京德朔实业有限公司 | Electric tool |
| CN116865225A (en) * | 2023-09-04 | 2023-10-10 | 深圳莱福德科技股份有限公司 | Input overvoltage protection circuit |
| CN117977942A (en) * | 2024-04-02 | 2024-05-03 | 四川升华电源科技有限公司 | Protection circuit and switching power supply |
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| CN101582580A (en) * | 2009-06-09 | 2009-11-18 | 广州金升阳科技有限公司 | Input/output over-voltage protection circuit |
| US20120091982A1 (en) * | 2008-06-19 | 2012-04-19 | Power Integrations, Inc. | Power factor correction converter control offset |
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| CN1116741A (en) * | 1994-02-22 | 1996-02-14 | 国际商业机器公司 | AC line stabilization circuitry for high power factor loads |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854811A (en) * | 2018-08-21 | 2020-02-28 | 南京德朔实业有限公司 | Electric tool |
| CN116865225A (en) * | 2023-09-04 | 2023-10-10 | 深圳莱福德科技股份有限公司 | Input overvoltage protection circuit |
| CN116865225B (en) * | 2023-09-04 | 2024-01-05 | 深圳莱福德科技股份有限公司 | Input overvoltage protection circuit |
| CN117977942A (en) * | 2024-04-02 | 2024-05-03 | 四川升华电源科技有限公司 | Protection circuit and switching power supply |
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