CN211744037U - Protection circuit for surge voltage caused by bus transient voltage falling - Google Patents
Protection circuit for surge voltage caused by bus transient voltage falling Download PDFInfo
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- CN211744037U CN211744037U CN201922329912.4U CN201922329912U CN211744037U CN 211744037 U CN211744037 U CN 211744037U CN 201922329912 U CN201922329912 U CN 201922329912U CN 211744037 U CN211744037 U CN 211744037U
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Abstract
The utility model relates to a protection circuit of surge voltage caused by bus transient voltage falling, which is characterized in that the protection circuit comprises a voltage source, a pre-charging circuit, a power failure rapid detection circuit, a bus switch and a post-stage power utilization circuit; the power failure detection circuit comprises a voltage source, a bus switch, a power failure rapid detection circuit, a rear-stage electricity utilization circuit, a pre-charging circuit, a power source, a third port, a second control port, a third control port, a second control port and a rear-stage electricity utilization circuit, wherein the voltage source is connected with the first port and the pre-charging circuit of the bus switch, the second port of the bus switch is connected with the power failure rapid detection circuit, the third port of the bus switch is connected with the first control port of the power failure rapid detection circuit, the second control port of the power failure rapid detection circuit is connected with the rear-stage. The utility model discloses utilize system's abnormal signal control precharge circuit to carry out precharge again, restart the circuit for the back level again, arouse high current peak and high voltage transient change value when recovering rapidly after avoiding the bus voltage whereabouts, avoid damaging the circuit for the back level.
Description
Technical Field
The utility model relates to an electronic circuit technical field, specific theory relates to a protection circuit who arouses surge voltage because of generating line transient voltage whereabouts.
Background
In the conventional power supply circuit, the bus voltage is instantaneously reduced due to mechanical vibration, circuit interference and the like, and the bus voltage is restored after the high voltage is suddenly reduced, so that the bus voltage generates a high transient change value (dv/dt) and a high current peak value (di/dt) is caused. Because of the existence of the parasitic inductance of the line, the bus can generate a large voltage peak, which causes the voltage stress of the rear-stage circuit to exceed the standard and the load to work abnormally.
The above problems are worth solving.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, the utility model provides a protection circuit for causing surge voltage because of the whereabouts of generating line transient voltage.
The utility model discloses technical scheme as follows:
a protection circuit for surge voltage caused by bus transient voltage falling is characterized by comprising a voltage source, a pre-charging circuit, a power failure rapid detection circuit, a bus switch and a post-stage power utilization circuit;
the voltage source is respectively connected with the first port of the bus switch and the input end of the pre-charging circuit, the second port of the bus switch is respectively connected with the detection port of the power-down rapid detection circuit, the rear-stage power utilization circuit and the output end of the pre-charging circuit, the third port of the bus switch is connected with the first control port of the power-down rapid detection circuit, the second control port of the power-down rapid detection circuit is connected with the rear-stage power utilization circuit, and the rear-stage power utilization circuit is connected with the voltage source.
According to the utility model discloses of above-mentioned this scheme, its characterized in that, precharge circuit includes precharge switch and charging resistor, precharge switch with charging resistor establishes ties.
Further, the pre-charging switch is a diode, a relay, a triode, a MOS (metal oxide semiconductor) tube, an IGBT or a conducting wire.
Further, the charging resistor is a power resistor or a thermistor.
The utility model is characterized in that the power failure rapid detection circuit comprises a detection circuit, a filter capacitor, a delay circuit, a comparator and a pull-up resistor;
the detection circuit comprises a plurality of detection resistors connected in series, the head end of the detection circuit is connected with the second port of the bus switch, the detection resistor at the tail end of the detection circuit is connected with the filter capacitor in parallel and is grounded, and the non-grounded ends of the resistors are respectively connected with the delay circuit and the inverting input end of the comparator;
the delay circuit comprises a first divider resistor, a second divider resistor, a delay capacitor and a return difference resistor, wherein the first divider resistor and the second divider resistor are connected in series, are connected to the same-phase input end of the comparator and are connected with the return difference resistor, one end of the delay capacitor is connected between the first divider resistor and the second divider resistor, and the other end of the delay capacitor is grounded; the other end of the return difference resistor is connected with the anode of a single-phase diode, and the cathode of the single-phase diode is connected with the output end of the comparator;
the output end of the comparator is connected with an 'LV-OFF' port, a pin8 of the comparator is connected with a 12V power supply, and a pin4 of the comparator is grounded; one end of the pull-up resistor is connected with the pin8 of the comparator, and the other end of the pull-up resistor is connected with the output end of the comparator.
The utility model is characterized in that the power failure rapid detection circuit comprises a detection circuit, a filter capacitor and a singlechip; the detection circuit comprises a plurality of detection resistors connected in series, the head end of the detection circuit is connected with the second port of the bus switch, the detection resistor at the tail end of the detection circuit is connected with the filter capacitor in parallel and is grounded, and the non-grounded end of the resistor is connected with the pin 11 of the single chip microcomputer; and a pin 5 of the singlechip is connected with an LV-OFF port.
According to the above scheme the utility model discloses, its beneficial effect lies in:
the power failure rapid detection circuit can rapidly receive and judge the abnormal signals of the system, and convert the signals into voltage switch control signals to control the switches of the bus switch and the rear-stage circuit, thereby controlling the pre-charging circuit to pre-charge again and restart the rear-stage circuit.
Drawings
Fig. 1 is a circuit module structure diagram of the present invention.
Fig. 2 is a circuit diagram of the first embodiment.
Fig. 3 is a circuit diagram of the second embodiment.
Fig. 4 is a circuit diagram of a precharge circuit of a preferred embodiment.
Detailed Description
For better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be noted that the following examples are only for explaining the present invention and are not intended to limit the present invention.
As shown in fig. 1, an embodiment of the present invention provides a protection circuit for surge voltage caused by bus transient voltage drop, which includes a voltage source, a pre-charging circuit, a power-down fast detection circuit, a bus switch and a post-stage power utilization circuit; the voltage source is respectively connected with a first port of the bus switch and an input end of the pre-charging circuit, a second port of the bus switch is respectively connected with a detection port of the power-down rapid detection circuit, a rear-stage power utilization circuit and an output end of the pre-charging circuit, a third port of the bus switch is connected with a first control port of the power-down rapid detection circuit, a second control port of the power-down rapid detection circuit is connected with the rear-stage power utilization circuit, and the rear-stage power utilization circuit is connected with the voltage source.
As shown in FIG. 2, in the first embodiment, the protection circuit for surge voltage caused by bus transient voltage drop comprises a voltage source input end "HV 1", the voltage source input end "HV 1" is connected with a pre-charging circuit, the pre-charging circuit comprises a relay RLY3-B and a power resistor R73 which are connected in series, the voltage source input end "HV 1" is also connected with a bus switch RLY4-B and a detection circuit, the detection circuit comprises three detection resistors R175, R177 and R170 which are connected in series, and a filter capacitor C44 connected with the third detection resistor R170 in parallel, and the tail end of the detection circuit is grounded; and the signal of the system is transmitted to a judgment area of the power failure rapid detection circuit through the detection circuit for judgment.
A delay circuit is connected between the third detection resistor R170 and the second detection resistor R177 and is connected to an inverting input terminal PIN2 of the comparator U8-A; the delay circuit comprises a first voltage-dividing resistor R248 and a second voltage-dividing resistor R256 which are connected in series, a delay capacitor C256 and a return difference resistor R250; one end of the delay capacitor C256 is connected between the first divider resistor R248 and the second divider resistor R256, and the other end is grounded; one end of a second voltage-dividing resistor R256 is respectively connected with a non-inverting input terminal PIN3 and a return difference resistor R250 of a comparator U8-A, the other end of the return difference resistor R250 is connected with the anode of a single-phase diode D34, and the cathode of the single-phase diode D34 is connected with an 'LV-OFF' port; the output end of the comparator U8-A is connected with an 'LV-OFF' port, a power supply PIN PIN8 is connected with a 12V power supply, and a grounding PIN PIN4 is grounded; one end of the pull-up resistor is connected with a pin8 of the comparator U8-A, and the other end of the pull-up resistor is connected with the output end of the comparator.
The signal filtered by the filter capacitor C44 is directly transmitted to an inverting input terminal PIN2 of the comparator U8-A, and the signal subjected to voltage division by the voltage dividing resistors R248 and R256 and the return difference resistor R250 is transmitted to a non-inverting input terminal PIN3 of the comparator U8-A, at the moment, the voltage of the inverting input terminal of the comparator U8-A is larger than the voltage of the non-inverting input terminal, a 'LV-OFF' port is at a low level, the power failure rapid detection circuit maintains a bus switch RLY4-B closed state, and a rear-stage power utilization circuit works normally.
When the instantaneous power failure of a voltage source input end 'HV 1' reaches a certain threshold value, the voltage of an inverting input end PIN2 of a comparator U8-A is reduced, the voltage of a non-inverting input end PIN3 of the comparator U8-A has the delay effect of a delay capacitor C256, so that the voltage of a non-inverting input end PIN3 is higher than the voltage of an inverting input end PIN2, the 'LV-OFF' port is at a high level, a power failure rapid detection circuit outputs a switch control signal, a bus switch RLY4-B is disconnected, namely a rear-stage power utilization circuit is closed, when the voltage recovers, the bus voltage is precharged again through the precharge circuit and then restarted, and due to the fact that a power resistor R73 limits the charging current, the bus voltage is prevented from generating high current spikes and high transient voltage change values when the bus voltage recovers rapidly, and damage to the rear-stage power utilization circuit is avoided.
As shown in FIG. 3, in the second embodiment, the protection circuit for preventing the surge voltage caused by the bus transient voltage drop comprises a voltage source input end "HV 1", the voltage source input end "HV 1" is connected with a pre-charging circuit, the pre-charging circuit comprises a diode D5 and a power resistor R92 which are connected in series, the voltage source input end "HV 1" is further connected with a bus switch RLY6-B and a detection circuit, the detection circuit comprises three detection resistors R78, R79 and R62 which are connected in series, and a filter capacitor C7 which is connected with a third detection resistor R62 in parallel, and the tail end of the detection circuit is grounded.
A branch is led out between the third detection resistor R62 and the second detection resistor R79 and is connected with a pin 11 of the singlechip U4, and a pin 5 of the singlechip U4 is connected with an LV-OFF port.
As shown in fig. 4, a preferred precharge circuit combination, which includes a conducting wire and a power resistor R80, has a simple structure and low cost, and can also implement the function of a precharge circuit.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. A protection circuit for surge voltage caused by bus transient voltage falling is characterized by comprising a voltage source, a pre-charging circuit, a power failure rapid detection circuit, a bus switch and a post-stage power utilization circuit;
the voltage source is respectively connected with the first port of the bus switch and the input end of the pre-charging circuit, the second port of the bus switch is respectively connected with the detection port of the power-down rapid detection circuit, the rear-stage power utilization circuit and the output end of the pre-charging circuit, the third port of the bus switch is connected with the first control port of the power-down rapid detection circuit, the second control port of the power-down rapid detection circuit is connected with the rear-stage power utilization circuit, and the rear-stage power utilization circuit is connected with the voltage source.
2. The protection circuit for the surge voltage caused by the bus transient voltage drop as claimed in claim 1, wherein said pre-charging circuit comprises a pre-charging switch and a charging resistor, said pre-charging switch is connected in series with said charging resistor.
3. The protection circuit for the surge voltage caused by the bus transient voltage drop as claimed in claim 2, wherein said pre-charge switch is a diode or a relay or a triode or a MOS tube or an IGBT or a conducting wire.
4. The protection circuit for the surge voltage caused by the bus transient voltage drop as claimed in claim 2, wherein said charging resistor is a power resistor or a thermistor.
5. The protection circuit for the surge voltage caused by the bus transient voltage drop is characterized in that the power failure rapid detection circuit comprises a detection circuit, a filter capacitor, a delay circuit, a comparator and a pull-up resistor;
the detection circuit comprises a plurality of detection resistors connected in series, the head end of the detection circuit is connected with the second port of the bus switch, the detection resistor at the tail end of the detection circuit is connected with the filter capacitor in parallel and is grounded, and the non-grounded ends of the resistors are respectively connected with the delay circuit and the inverting input end of the comparator;
the delay circuit comprises a first divider resistor, a second divider resistor, a delay capacitor and a return difference resistor, wherein the first divider resistor and the second divider resistor are connected in series, are connected to the same-phase input end of the comparator and are connected with the return difference resistor, one end of the delay capacitor is connected between the first divider resistor and the second divider resistor, and the other end of the delay capacitor is grounded; the other end of the return difference resistor is connected with the anode of a single-phase diode, and the cathode of the single-phase diode is connected with the output end of the comparator;
the output end of the comparator is connected with an 'LV-OFF' port, a pin8 of the comparator is connected with a 12V power supply, and a pin4 of the comparator is grounded; one end of the pull-up resistor is connected with the pin8 of the comparator, and the other end of the pull-up resistor is connected with the output end of the comparator.
6. The protection circuit for the surge voltage caused by the bus transient voltage drop according to claim 1, wherein the power-down rapid detection circuit comprises a detection circuit, a filter capacitor and a single chip microcomputer; the detection circuit comprises a plurality of detection resistors connected in series, the head end of the detection circuit is connected with the second port of the bus switch, the detection resistor at the tail end of the detection circuit is connected with the filter capacitor in parallel and grounded, the non-grounded end of the resistor is connected with the pin 11 of the single chip microcomputer, and the pin 5 of the single chip microcomputer is connected with the 'LV-OFF' port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329912.4U CN211744037U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for surge voltage caused by bus transient voltage falling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329912.4U CN211744037U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for surge voltage caused by bus transient voltage falling |
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| Publication Number | Publication Date |
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| CN211744037U true CN211744037U (en) | 2020-10-23 |
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| CN201922329912.4U Active CN211744037U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for surge voltage caused by bus transient voltage falling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254315A (en) * | 2020-11-11 | 2021-01-22 | 佛山市顺德区美的电子科技有限公司 | DC fan high voltage protection circuit, air conditioner controller, outdoor unit and air conditioner |
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2019
- 2019-12-23 CN CN201922329912.4U patent/CN211744037U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254315A (en) * | 2020-11-11 | 2021-01-22 | 佛山市顺德区美的电子科技有限公司 | DC fan high voltage protection circuit, air conditioner controller, outdoor unit and air conditioner |
| CN112254315B (en) * | 2020-11-11 | 2025-01-21 | 佛山市顺德区美的电子科技有限公司 | DC fan high voltage protection circuit, air conditioning controller, outdoor unit and air conditioner |
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