CN201383673Y - Power supply over-current protection circuit of vehicle-mounted inverter - Google Patents
Power supply over-current protection circuit of vehicle-mounted inverter Download PDFInfo
- Publication number
- CN201383673Y CN201383673Y CN200920070942U CN200920070942U CN201383673Y CN 201383673 Y CN201383673 Y CN 201383673Y CN 200920070942 U CN200920070942 U CN 200920070942U CN 200920070942 U CN200920070942 U CN 200920070942U CN 201383673 Y CN201383673 Y CN 201383673Y
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- comparator
- power supply
- resistance
- amplifier
- input end
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- Expired - Lifetime
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model relates to a power supply over-current protection circuit of a vehicle-mounted inverter, which is characterized in that: the circuit comprises an amplifier, an electric current sampling signal is input by the non-inverting input end of the amplifier, the output end of the amplifier is connected with the non-inverting input end of a first comparator by a delay circuit, the inverting input end of the first comparator is respectively connected with a comparative power supply and the ground by a first resistance and a second resistance, the output end of the first comparator is connected with a second diode, the output end of the amplifier is connected with the inverting input end of a second comparator by a fourth resistance, a first diode is bridged over between the non-inverting input end and the output end of the second comparator, the non-inverting input end of the second comparator is connected between the comparative power supply and the first resistance, and the output end of the second comparator is connected with a third diode. The power supply over-current protection circuit has the advantages that miss shutoff can not happen and short-circuit protective function is added.
Description
Technical field
The utility model relates to a kind of vehicle-mounted inverter power supply circuit overcurrent protection, belongs to technical field of automotive electronics.
Background technology
In general power supply product, as long as circuit overcurrent protection detects load overload, this load be moment overload or long heavy duty all will send cut-off signals, whole electrical equipment is quit work.Clearly, such structure can produce the mistake shutoff.
Summary of the invention
The purpose of this utility model provides a kind of circuit overcurrent protection that mistake is turn-offed that can not produce.
In order to achieve the above object; the technical solution of the utility model provides a kind of vehicle-mounted inverter power supply circuit overcurrent protection; it is characterized in that; comprise amplifier; current sampling signal is by the in-phase input end input of amplifier; the output of amplifier connects the in-phase input end of first comparator by delay circuit; the inverting input of first comparator connects relatively power supply and ground by first resistance and second resistance respectively; the output of first comparator connects second diode; the output of amplifier connects the inverting input of second comparator by the 4th resistance; cross-over connection first diode between the in-phase input end of second comparator and the output; the in-phase input end of second comparator inserts and compares between the power supply and first resistance, and the output of second comparator connects the 3rd diode.
The utility model is provided with time of moment overcurrent by delay circuit, if moment overcurrent time less than setting-up time, then first comparator can not send overload signal, and during short circuit, circuit of the present utility model sends cut-off signals by second comparator.
The utility model has the advantages that: can not produce the mistake shutoff has increased short-circuit protection function simultaneously.
Description of drawings
The physical circuit figure of a kind of vehicle-mounted inverter power supply circuit overcurrent protection that Fig. 1 provides for the utility model.
Embodiment
Specify the utility model below in conjunction with embodiment.
Embodiment
As shown in Figure 1, the physical circuit figure of a kind of vehicle-mounted inverter power supply circuit overcurrent protection that provides for the utility model, cross-over connection the 6th resistance R _ f between the output of integrated operational amplifier A and inverting input, first capacitor C 1 in parallel on the 6th resistance R _ f, the inverting input of integrated operational amplifier A is by the 5th resistance R s ground connection, current sampling signal is imported the in-phase input end of integrated operational amplifier A, has formed amplifier U1A thus, and the multiplication factor of this amplifier is Rf/Rs;
The output of integrated operational amplifier A connects the in-phase input end of the first comparator U2A by the delay circuit of being made of the 3rd resistance R 3 and the 3rd capacitor C 3, moment overcurrent time T=R3*C3, the time T setting of RC will be determined according to the current characteristics of main switching device in the major loop, the inverting input of the first comparator U2A connects relatively power supply Vref and ground by first resistance R 1 and second resistance R 2 respectively, second capacitor C 2 inserts first resistance R 1 and compares between the power supply Vref, cross-over connection the 4th capacitor C 4 between the power Vcc of the first comparator U2A and ground, the output of the first comparator U2A connects the second diode D2, the output of amplifier U1A connects the inverting input of the second comparator U1B by the 4th resistance R 4, the cross-over connection first diode D1 between the in-phase input end of the second comparator U1B and the output, the in-phase input end of the second comparator U1B inserts and compares between the power supply Vref and first resistance R 1, the output of cross-over connection the 5th capacitor C 5, the second comparator U1B connects the 3rd diode D3 between the power Vcc of the second comparator U1B and ground.
By amplifier U1A signal is amplified Rf/Rs doubly, the big I of Rf/Rs is determined according to the power that you need protection.If the overcurrent time surpasses the RC charging interval T=R3*C3 of this setting, then be judged as certain overload, send cut-off signals by the first comparator U2A, allow electrical equipment quit work; If the time of overcurrent is set the T time less than this, then be judged as the moment overcurrent, the first comparator U2A can not send cut-off signals.The phenomenon that so just can well avoid mistake to turn-off can demonstrate fully the electrical equipment load capacity.Simultaneously; for fear of the impact that infinitely-great electric current is arranged sometimes; phenomenon such as load short circuits; and be provided with short-circuit protection circuit specially; the second comparator U1B is direct and amplifier U1A signal is made comparisons, and has omitted the link of the RC circuit and the first comparator U2A, can send cut-off signals fast; electrical equipment is quit work, guarantee the integrity of electrical equipment.
Claims (1)
1. vehicle-mounted inverter power supply circuit overcurrent protection; it is characterized in that; comprise amplifier (U1A); current sampling signal is by the in-phase input end input of amplifier (U1A); the output of amplifier (U1A) connects the in-phase input end of first comparator (U2A) by delay circuit; the inverting input of first comparator (U2A) connects relatively power supply (Vref) and ground by first resistance (R1) and second resistance (R2) respectively; the output of first comparator (U2A) connects second diode (D2); the output of amplifier (U1A) connects the inverting input of second comparator (U1B) by the 4th resistance (R4); cross-over connection first diode (D1) between the in-phase input end of second comparator (U1B) and the output; the in-phase input end of second comparator (U1B) inserts and compares between power supply (Vref) and first resistance (R1), and the output of second comparator (U1B) connects the 3rd diode (D3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920070942U CN201383673Y (en) | 2009-04-22 | 2009-04-22 | Power supply over-current protection circuit of vehicle-mounted inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920070942U CN201383673Y (en) | 2009-04-22 | 2009-04-22 | Power supply over-current protection circuit of vehicle-mounted inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201383673Y true CN201383673Y (en) | 2010-01-13 |
Family
ID=41527145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920070942U Expired - Lifetime CN201383673Y (en) | 2009-04-22 | 2009-04-22 | Power supply over-current protection circuit of vehicle-mounted inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201383673Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441467A (en) * | 2013-05-22 | 2013-12-11 | 佛山市宝星科技发展有限公司 | Load nonlinear progressively-increasing delay protection circuit |
| CN104459524A (en) * | 2013-09-12 | 2015-03-25 | 施耐德电器工业公司 | Auxiliary unit, electric system comprising a circuit breaker and one such auxiliary unit, and method for determining a cause of opening of the circuit breaker |
-
2009
- 2009-04-22 CN CN200920070942U patent/CN201383673Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441467A (en) * | 2013-05-22 | 2013-12-11 | 佛山市宝星科技发展有限公司 | Load nonlinear progressively-increasing delay protection circuit |
| CN103441467B (en) * | 2013-05-22 | 2017-12-26 | 广东宝星新能科技有限公司 | Load nonlinear progressively-increadelay delay protection circuit |
| CN104459524A (en) * | 2013-09-12 | 2015-03-25 | 施耐德电器工业公司 | Auxiliary unit, electric system comprising a circuit breaker and one such auxiliary unit, and method for determining a cause of opening of the circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 201800, B, Lane 518, Lane 1, Heng Yong Road, Shanghai, Jiading District 501-1 Patentee after: Shanghai Fengtian Electronic Co., Ltd. Address before: 200331, Shanghai, Gulang Road, Putuo District, Lane 5, building 1570, West 2-3 Patentee before: Shanghai Fengtian Electronic Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100113 |