CN202856324U - Inverter overvoltage and under-voltage protective circuit - Google Patents
Inverter overvoltage and under-voltage protective circuit Download PDFInfo
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- CN202856324U CN202856324U CN 201220414848 CN201220414848U CN202856324U CN 202856324 U CN202856324 U CN 202856324U CN 201220414848 CN201220414848 CN 201220414848 CN 201220414848 U CN201220414848 U CN 201220414848U CN 202856324 U CN202856324 U CN 202856324U
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Abstract
Provided is an inverter overvoltage and under-voltage protective circuit, comprising a voltage dividing unit, an overvoltage detecting unit, an under-voltage detecting unit, a switch control unit, and an output control unit, wherein the voltage dividing unit carries out voltage division over the input voltage of the inverter and comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6; the overvoltage detecting unit comprises an NPN type triode Q1, a resistor R7, and a resistor R8; the under-voltage detecting unit comprises a PNP type triode Q2, a resistor R9, and a resistor R10; the output control unit comprises an N type MOS pipe Q3 and a resistor R11; and the switch control unit comprises a logic gate U1. The inverter overvoltage and under-voltage protective circuit of the utility model features simple circuit structure, less components, low cost, and less space occupation. In addition, the inverter overvoltage and under-voltage protective circuit adopts simple components and is easy to debug and carry out error correction. The circuit of the utility model belongs to the pure analog control and is capable of meeting the requirements for real-time protection.
Description
Technical field
The utility model relates to the voltage protection technical field, relates in particular to a kind of inverter overvoltage and under-voltage protecting circuit.
Background technology
Inverter is a kind of power adjusting device that is comprised of semiconductor device, is mainly used in direct current power is converted to alternating electromotive force.Current inverter detects with operational amplifier or the voltage comparator voltage to two simulations of input usually to too high, the excessively low protective circuit of input voltage; then control signal is transferred to PWM(pulse width modulation) chip realization control; thereby supply power voltage is stabilized in the normal range (NR), and it is in and is unlikely under overvoltage or the under-voltage condition to damage or irregular working to reach protection.But this mode needs a fairly large number of components and parts could realize that circuit structure is more complicated also, and production cost is high.And the components and parts of this judgement are realized by chip, and the reaction speed of chip is relatively slow, can not satisfy the requirement of real-time guard, causes inverter because protecting untimely the damage.
The utility model content
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, and a kind of inverter overvoltage and under-voltage protecting circuit are provided, and this circuit is simple in structure, uses component number few, is in time protected in the time of can making the inverter input voltage too high or too low.
The purpose of this utility model is achieved through the following technical solutions:
A kind of inverter overvoltage and under-voltage protecting circuit comprise partial pressure unit, overvoltage detecting unit, under-voltage detecting unit, switch control unit and output control unit, wherein,
The inverter input voltage is carried out the partial pressure unit of dividing potential drop, comprise resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6;
The overvoltage detecting unit comprises NPN type triode Q1, resistance R 7 and resistance R 8;
Under-voltage detecting unit comprises positive-negative-positive triode Q2, resistance R 9 and resistance R 10;
Output control unit comprises N-type metal-oxide-semiconductor Q3 and resistance R 11;
Switch control unit comprises gate U1;
Resistance R 1 one ends are connected with the direct current input is anodal, the other end and resistance R 2, resistance R 3, resistance R 4, resistance R 5 series connection connect successively, resistance R 5 other ends and triode Q1 base stage, the base stage of triode Q2 connects respectively, resistance R 5 is connected with direct current input negative pole by resistance R 6 simultaneously, the collector electrode of triode Q1 is by resistance R 8 ground connection, the collector electrode of Q1 is connected with direct power Vcc by resistance R 7 simultaneously, very overvoltage control signal of the emission output of triode Q1, the emitter of triode Q2 is by resistance R 10 ground connection, triode Q2 is connected the very under-voltage control signal output of the current collection of triode Q2 by resistance R 9 simultaneously with DC power supply Vcc; The collector electrode of triode Q2 is connected with resistance R 11 1 ends with the emitter of triode Q1 simultaneously, the other end of resistance R 11 is connected with the grid of metal-oxide-semiconductor Q3, the grounded drain of metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q3 is connected with one of them input of gate U1, and another input of gate U1 drives signal for the PWM of input.
Preferably, described output control unit also comprises protective resistance R12, and protective resistance R12 one end is connected with DC power supply Vcc, and the other end is connected with the metal-oxide-semiconductor source electrode.
Preferably, described gate U1 is and door.
The utility model has the following advantages and beneficial effect compared to existing technology:
The utility model passes through partial pressure unit, the overvoltage detecting unit, under-voltage detecting unit, switch control unit and output control unit, when inverter direct current input cathode voltage is too high, triode Q1 conducting, triode Q2 cut-off, metal-oxide-semiconductor Q3 conducting, gate U1 is output as low level, closes PWM and drives signal, and inverter transfers the overvoltage protection state to by normal operating conditions, when inverter direct current input cathode voltage is crossed when low, triode Q1 cut-off, triode Q2 conducting, metal-oxide-semiconductor Q3 conducting, triode Q3 source electrode output voltage V ss is low level, gate U1 is output as low level, closes PWM and drives signal, and inverter transfers the under-voltage protection state to by normal operating conditions, the utility model circuit structure is simple, components and parts are few, and cost is low, and the position that takes up room is few; In addition, the components and parts of employing are simple, are easy to debugging and error correction; Moreover the utility model circuit belongs to pure simulation control, can satisfy the real-time guard requirement.
Description of drawings
Fig. 1 is the circuit diagram of the utility model overvoltage and under-voltage protecting circuit.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, a kind of inverter overvoltage and under-voltage protecting circuit, comprise partial pressure unit, to inverter input voltage dividing potential drop, particularly the photovoltaic combining inverter input voltage range is wider owing to inverter, voltage is also higher, so it is also many to be used for the resistance consumption of dividing potential drop, and the resistance of the partial pressure unit that the utility model uses is Chip-R, its power is smaller, so described partial pressure unit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6; Described overvoltage and under-voltage protecting circuit also comprise following part:
The overvoltage detecting unit comprises NPN type triode Q1, resistance R 7 and resistance R 8;
Under-voltage detecting unit comprises positive-negative-positive triode Q2, resistance R 9 and resistance R 10;
Output control unit comprises N-type metal-oxide-semiconductor Q3 and resistance R 11;
Switch control unit comprises gate U1;
Concrete, resistance R 1 one ends are connected with the direct current input is anodal, the other end and resistance R 2, resistance R 3, resistance R 4, resistance R 5 series connection connect successively, resistance R 5 other ends and triode Q1 base stage, the base stage of triode Q2 connects respectively, resistance R 5 is connected with direct current input negative pole by resistance R 6 simultaneously, the collector electrode of triode Q1 is by resistance R 8 ground connection, the collector electrode of Q1 is connected with direct power Vcc by resistance R 7 simultaneously, very overvoltage control signal of the emission output of triode Q1, the emitter of triode Q2 is by resistance R 10 ground connection, triode Q2 is connected the very under-voltage control signal output of the current collection of triode Q2 by resistance R 9 simultaneously with DC power supply Vcc; The collector electrode of triode Q2 connects with resistance R 11 simultaneously with the emitter of triode Q1, the other end of resistance R 11 is connected with the grid of metal-oxide-semiconductor Q3, the grounded drain of metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q3 is connected with one of them input of gate U1, and another input of gate U1 drives signal for the PWM of input.
Preferably, described output control unit also comprises protective resistance R12, and protective resistance R12 one end is connected with DC power supply Vcc, and the other end is connected with the metal-oxide-semiconductor source electrode.
Preferably, described gate U1 is and door.
Operation principle of the present utility model is as follows:
A. overvoltage crowbar
When inverter direct current input cathode voltage DC+ voltage uprises; the voltage of the input voltage vin of the base stage of triode Q1 base stage and triode Q2 uprises thereupon; when the input voltage vin of the base stage of Q2 is higher than the emitter voltage Vo of the collector electrode of Q2 and Q1; triode Q1 conducting; triode Q2 cut-off; this moment, the emitter voltage Vo of triode Q1 was high level; cause metal-oxide-semiconductor Q3 conducting; metal-oxide-semiconductor Q3 source electrode output voltage V ss is low level; gate U1 is output as low level; close PWM and drive signal, inverter transfers the overvoltage protection state to by normal operating conditions.
B, under-voltage protecting circuit
When inverter direct current input cathode voltage DC+ voltage step-down; the voltage of the base stage input voltage vin of triode Q1 base stage and triode Q2 is step-down thereupon; when the base stage input voltage vin of Q2 is lower than triode Q2 emitter voltage V2; triode Q1 cut-off; triode Q2 conducting; this moment, the collector voltage Vo of triode Q2 was high level; cause metal-oxide-semiconductor Q3 conducting; metal-oxide-semiconductor Q3 source electrode output voltage V ss is low level; last U1 is output as low level; close PWM and drive signal, inverter transfers the under-voltage protection state to by normal operating conditions.
C, inverter normal power supply
When inverter direct current input cathode voltage DC+ voltage is normal power supply voltage, the base stage input voltage vin of triode Q1 base stage and triode Q2 is higher than triode Q2 emitter voltage and is lower than triode Q1 emitter voltage, triode Q1, triode Q2 are in cut-off state at this moment, this moment, the collector voltage Vo of triode Q2 was low level, metal-oxide-semiconductor Q3 cut-off, metal-oxide-semiconductor Q3 source electrode output voltage V ss is high level, and PWM drives signal and normally opens, and inverter is in normal operating conditions.
Above-described embodiment is the better execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (3)
1. an inverter overvoltage and under-voltage protecting circuit is characterized in that: comprise partial pressure unit, overvoltage detecting unit, under-voltage detecting unit, switch control unit and output control unit, wherein,
To the partial pressure unit of inverter input voltage dividing potential drop,, comprise resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6;
The overvoltage detecting unit comprises NPN type triode Q1, resistance R 7 and resistance R 8;
Under-voltage detecting unit comprises positive-negative-positive triode Q2, resistance R 9 and resistance R 10;
Output control unit comprises N-type metal-oxide-semiconductor Q3 and resistance R 11;
Switch control unit comprises gate U1;
Resistance R 1 one ends are connected with the direct current input is anodal, the other end and resistance R 2, resistance R 3, resistance R 4, resistance R 5 is connected in series, resistance R 5 other ends and triode Q1 base stage, the base stage of triode Q2 connects respectively, resistance R 5 is connected with direct current input negative pole by resistance R 6 simultaneously, the collector electrode of triode Q1 is by resistance R 8 ground connection, the collector electrode of Q1 is connected with direct power Vcc by resistance R 7 simultaneously, very overvoltage control signal of the emission output of triode Q1, the emitter of triode Q2 is by resistance R 10 ground connection, triode Q2 is connected the very under-voltage control signal output of the current collection of triode Q2 by resistance R 9 simultaneously with DC power supply Vcc; The collector electrode of triode Q2 is connected with resistance R 11 1 ends with the emitter of triode Q1 simultaneously, the other end of resistance R 11 is connected with the grid of metal-oxide-semiconductor Q3, the grounded drain of metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q3 is connected with one of them input of gate U1, and another input of gate U1 drives signal for the PWM of input.
2. according to claim 1 described inverter overvoltage and under-voltage protecting circuit, it is characterized in that: described output control unit also comprises protective resistance R12, and protective resistance R12 one end is connected with DC power supply Vcc, and the other end is connected with the metal-oxide-semiconductor source electrode.
3. according to claim 1 described inverter overvoltage and under-voltage protecting circuit is characterized in that: described gate U1 for and door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220414848 CN202856324U (en) | 2012-08-20 | 2012-08-20 | Inverter overvoltage and under-voltage protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220414848 CN202856324U (en) | 2012-08-20 | 2012-08-20 | Inverter overvoltage and under-voltage protective circuit |
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| CN202856324U true CN202856324U (en) | 2013-04-03 |
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| CN 201220414848 Expired - Fee Related CN202856324U (en) | 2012-08-20 | 2012-08-20 | Inverter overvoltage and under-voltage protective circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN113300321A (en) * | 2021-04-23 | 2021-08-24 | 上海卫星工程研究所 | Intelligent power distribution circuit based on MOSFET (metal-oxide-semiconductor field effect transistor), and satellite power distribution equipment |
-
2012
- 2012-08-20 CN CN 201220414848 patent/CN202856324U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN104020344B (en) * | 2014-06-24 | 2016-05-25 | 新誉集团有限公司 | Prime overvoltage checkout gear for trolley coach |
| CN113300321A (en) * | 2021-04-23 | 2021-08-24 | 上海卫星工程研究所 | Intelligent power distribution circuit based on MOSFET (metal-oxide-semiconductor field effect transistor), and satellite power distribution equipment |
| CN113300321B (en) * | 2021-04-23 | 2023-03-14 | 上海卫星工程研究所 | Intelligent power distribution circuit based on MOSFET (metal-oxide-semiconductor field effect transistor), and satellite power distribution equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20210820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |