CN202623957U - Overcurrent protection circuit of electric automobile controller - Google Patents
Overcurrent protection circuit of electric automobile controller Download PDFInfo
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- CN202623957U CN202623957U CN 201220188294 CN201220188294U CN202623957U CN 202623957 U CN202623957 U CN 202623957U CN 201220188294 CN201220188294 CN 201220188294 CN 201220188294 U CN201220188294 U CN 201220188294U CN 202623957 U CN202623957 U CN 202623957U
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Abstract
The utility model relates to an overcurrent protection circuit of an electric automobile controller. The overcurrent protection circuit comprises a first-stage voltage comparison circuit, a second-stage voltage comparison circuit and a voltage setting circuit, wherein the output end of the voltage setting circuit is used for respectively providing comparison reference voltage (Uref2 and Uref1) to the first-stage voltage comparison circuit and the second-stage voltage comparison circuit. The overcurrent protection circuit further comprises a first-stage delay circuit, a second-stage delay circuit and an absolute value circuit, alternating current or direct current signals (Vin) q43 processed and converted by the absolute value circuit into direct current signals (Vout), and the direct current signals (Vout) are divided into two paths of signals, wherein one path of signals are processed by the first-stage delay circuit and the first-stage voltage comparison circuit, the other path of signals are processed by the second-stage delay circuit and the second-stage voltage comparison circuit, and overcurrent protection signals (Vifo) are output according to different overcurrent stages so as to carry out alternating current overcurrent protection and direct current overcurrent protection. The overcurrent protection circuit can provide immediate and exact protection when a motor suffers from overcurrent and stops, and a system can regularly run during starting with large torque.
Description
Technical field:
The utility model relates to a kind of electric vehicle controller current foldback circuit.
Background technology:
At present, the overcurrent protection of traditional driving system controller generally is to adopt the one-level overcurrent protection.Current foldback circuit is the interchange overcurrent protection, can not do delay process, and when the big torque of motor started and stall occurs, system can not control effectively timely and accurately, causes burning motor, causes electrical fault or greater loss.
The utility model content:
The purpose of the utility model provides a kind of electric vehicle controller current foldback circuit, and it is provided with the two-stage protection, and is safe and reliable, reduces fault and takes place, and effectively protects motor.
The purpose of the utility model is achieved through following technical proposals.
A kind of electric vehicle controller current foldback circuit; Comprise one-level voltage comparator circuit, secondary voltage comparator circuit and voltage setting circuit; The mouth of voltage setting circuit is respectively the one-level voltage comparator circuit, the secondary voltage comparator circuit provides benchmark voltage U ref2, Uref1; It also comprises one-level time delay circuit, secondary time delay circuit and absolute value circuit in addition; Interchange or direct current signal Vin become direct current signal Vou through the absolute value circuit treatment conversion), direct current signal Vout splits into two paths of signals, and one the tunnel through one-level time delay circuit and the processing of one-level voltage comparator circuit; Handle through secondary time delay circuit and secondary voltage comparator circuit on another road, according to different overcurrent grade output overcurrent guard signal Vifo.
The absolute value circuit of above-mentioned electric vehicle controller current foldback circuit is op amp IC1.
VREF (Voltage Reference) when the benchmark voltage U ref1 of above-mentioned electric vehicle controller current foldback circuit is 1.1-1.3 a times of peak power electric current; VREF (Voltage Reference) when benchmark voltage U ref2 is 1.5-2 a times of peak power electric current, Uref2 has precedence over Uref1.
The one-level time delay circuit of above-mentioned electric vehicle controller current foldback circuit, the delay time of secondary time delay circuit are respectively time T 1 and time T 2; T1 < T2; Behind the electric current elapsed time T1 if the 1.5-2 that reaches the peak power electric current doubly; One-level voltage comparator circuit output overcurrent guard signal Vifo, behind the electric current elapsed time T2 if the 1.1-1.3 that reaches the peak power electric current doubly, secondary voltage comparator circuit output overcurrent guard signal Vifo.
The one-level time delay circuit of above-mentioned electric vehicle controller current foldback circuit is made up of resistance R 3, capacitor C 2, and the secondary time delay circuit is made up of resistance R 2, capacitor C 3.
The one-level voltage comparator circuit of above-mentioned electric vehicle controller current foldback circuit mainly is made up of voltage comparator ic 2A, and the secondary voltage comparator circuit mainly is made up of voltage comparator ic 2B.
The absolute value circuit IC1 of above-mentioned electric vehicle controller current foldback circuit adopts no outer meeting resistance operational amplifier A D8277.
The utility model compared with prior art has following advantage: 1) protection of two-stage overcurrent circuit protection and two-stage time delay circuit is set in its protective circuit; Signal through with current sensor converts direct current signal to, with controlling according to overcurrent grade output overcurrent signal after the time-delay of direct current signal two-stage, when motor generation overcurrent and motor rotation blockage, can protect timely and accurately again; System's ability normal operation when big torque starts; Safe and reliable, reduce fault and take place, effectively protect motor; 2) Applicable scope broad exchanged also direct current overcurrent protection of overcurrent protection but both can do; 3) one-level time delay circuit, secondary time delay circuit are set, make control more accurate; VREF (Voltage Reference) when 4) the benchmark voltage U ref1 of electric vehicle controller current foldback circuit is 1.1-1.3 a times of peak power electric current; VREF (Voltage Reference) when benchmark voltage U ref2 is 1.5-2 a times of peak power electric current, Uref2 has precedence over Uref1, and the delay time of one-level time delay circuit, secondary time delay circuit is respectively time T 1 and time T 2; T1 < T2; Behind the electric current elapsed time T1 if the 1.5-2 that reaches the peak power electric current doubly, one-level voltage comparator circuit output overcurrent guard signal Vifo, behind the electric current elapsed time T2 if the 1.1-1.3 that reaches the peak power electric current doubly; Secondary voltage comparator circuit output overcurrent guard signal Vifo, reasonable in design; 5) the one-level time delay circuit of electric vehicle controller current foldback circuit is made up of resistance R 3, capacitor C 2; The secondary time delay circuit is made up of resistance R 2, capacitor C 3; The one-level voltage comparator circuit mainly is made up of voltage comparator ic 2A; The secondary voltage comparator circuit mainly is made up of voltage comparator ic 2B, and circuit structure is simple.
Description of drawings:
Fig. 1 is the circuit control principle figure of the utility model;
Fig. 2 is Fig. 1 corresponding electrical circuits figure;
Fig. 3 is the schematic diagram of current foldback circuit;
The specific embodiment:
Below through specific embodiment and combine accompanying drawing that the present invention is described in further detail:
Like Fig. 1, shown in Figure 2, a kind of electric vehicle controller current foldback circuit of the utility model comprises one-level voltage comparator circuit, secondary voltage comparator circuit and voltage setting circuit; The mouth of voltage setting circuit is respectively the one-level voltage comparator circuit, the secondary voltage comparator circuit provides benchmark voltage U ref2, Uref1, and it also comprises one-level time delay circuit, secondary time delay circuit and absolute value circuit in addition, and interchange or direct current signal Vin become direct current signal Vout through the absolute value circuit treatment conversion; Direct current signal Vout splits into two paths of signals; One the tunnel through one-level time delay circuit and the processing of one-level voltage comparator circuit, and handle through secondary time delay circuit and secondary voltage comparator circuit on another road, according to different overcurrent grade output overcurrent guard signal Vifo; Absolute value circuit is op amp IC1; VREF (Voltage Reference) when the VREF (Voltage Reference) when benchmark voltage U ref1 is 1.1-1.3 a times of peak power electric current, benchmark voltage U ref2 are 1.5-2 times of peak power electric current, Uref2 has precedence over Uref1; The delay time of one-level time delay circuit, secondary time delay circuit is respectively time T 1 and time T 2; T1 T2, behind the electric current elapsed time T1 if the 1.5-2 that reaches the peak power electric current doubly, one-level voltage comparator circuit output overcurrent guard signal Vifo; Behind the electric current elapsed time T2 if the 1.1-1.3 that reaches the peak power electric current doubly; Secondary voltage comparator circuit output overcurrent guard signal Vifo, the one-level time delay circuit is made up of resistance R 3, capacitor C 2, and the secondary time delay circuit is made up of resistance R 2, capacitor C 3; The one-level voltage comparator circuit mainly is made up of voltage comparator ic 2A; The secondary voltage comparator circuit mainly is made up of voltage comparator ic 2B, and interchange or direct current signal Vin are produced by current sensor, and absolute value circuit IC1 adopts no outer meeting resistance operational amplifier A D8277.
The principle of the utility model is: as shown in Figure 3; When the time T 1 of one-level time delay circuit; VREF (Voltage Reference) when benchmark voltage U ref2 is 1.5-2 a times of peak power electric current; If incoming signal Vout is greater than Uref2, one-level voltage comparator circuit output overcurrent guard signal Vifo also delivers to electric machine controller, and electric machine controller is closed down motor; After motor operates steadily; Promptly pass through the delay time T2 of secondary time delay circuit; VREF (Voltage Reference) when benchmark voltage U ref1 is 1.1-1.3 a times of peak power electric current; If greater than Uref1, secondary voltage comparator circuit output overcurrent guard signal Vifo also delivers to electric machine controller as if incoming signal Vout, electric machine controller is closed down motor.It is provided with dual-electrode protecting circuit; Signal through with current sensor converts direct current signal to, with controlling according to overcurrent grade output overcurrent signal after the time-delay of direct current signal two-stage, when motor generation overcurrent and motor rotation blockage, can protect timely and accurately again; System ability normal operation when big torque starts; Safe and reliable, reduce fault and take place, effectively protect motor.
The foregoing description is the preferred embodiments of the utility model; But the embodiment of the utility model is not limited thereto; Other are any not to deviate from change, the modification done under spirit of the present invention and the principle, substitute, combination, simplify; Be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. electric vehicle controller current foldback circuit; Comprise one-level voltage comparator circuit, secondary voltage comparator circuit and voltage setting circuit; The mouth of voltage setting circuit is respectively the one-level voltage comparator circuit, the secondary voltage comparator circuit provides benchmark voltage (Uref2, Uref1); It is characterized in that: it also comprises one-level time delay circuit, secondary time delay circuit and absolute value circuit; Interchange or direct current signal (Vin) become direct current signal (Vout) through the absolute value circuit treatment conversion, and direct current signal (Vout) splits into two paths of signals, and one the tunnel through one-level time delay circuit and the processing of one-level voltage comparator circuit; Handle through secondary time delay circuit and secondary voltage comparator circuit on another road, according to different overcurrent grade output overcurrent guard signals (Vifo).
2. a kind of electric vehicle controller current foldback circuit according to claim 1 is characterized in that: absolute value circuit is op amp (IC1).
3. a kind of electric vehicle controller current foldback circuit according to claim 2; It is characterized in that: the VREF (Voltage Reference) of benchmark voltage (Uref1) during for 1.1-1.3 times of peak power electric current; VREF (Voltage Reference) when benchmark voltage (Uref2) is 1.5-2 times of peak power electric current, Uref2 has precedence over Uref1.
4. according to claim 1 or 2 or 3 described a kind of electric vehicle controller current foldback circuits; It is characterized in that: the delay time of one-level time delay circuit, secondary time delay circuit is respectively time T 1 and time T 2; T1 < T2; Behind the electric current elapsed time T1 if the 1.5-2 that reaches the peak power electric current doubly; One-level voltage comparator circuit output overcurrent guard signal (Vifo), behind the electric current elapsed time T2 if the 1.1-1.3 that reaches the peak power electric current doubly, secondary voltage comparator circuit output overcurrent guard signal (Vifo).
5. according to claim 1 or 2 or 3 described a kind of electric vehicle controller current foldback circuits, it is characterized in that: the one-level time delay circuit is made up of resistance (R3), electric capacity (C2), and the secondary time delay circuit is made up of resistance (R2), electric capacity (C3).
6. according to claim 1 or 2 or 3 described a kind of electric vehicle controller current foldback circuits; It is characterized in that: the one-level voltage comparator circuit mainly is made up of voltage comparator (IC2A), and the secondary voltage comparator circuit mainly is made up of voltage comparator (IC2B).
7. a kind of electric vehicle controller current foldback circuit according to claim 2 is characterized in that: described absolute value circuit (IC1) adopts no outer meeting resistance op amp (AD8277).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220188294 CN202623957U (en) | 2012-04-27 | 2012-04-27 | Overcurrent protection circuit of electric automobile controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220188294 CN202623957U (en) | 2012-04-27 | 2012-04-27 | Overcurrent protection circuit of electric automobile controller |
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| Publication Number | Publication Date |
|---|---|
| CN202623957U true CN202623957U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220188294 Expired - Lifetime CN202623957U (en) | 2012-04-27 | 2012-04-27 | Overcurrent protection circuit of electric automobile controller |
Country Status (1)
| Country | Link |
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| CN (1) | CN202623957U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426550A (en) * | 2019-08-16 | 2019-11-08 | 北京机械设备研究所 | A kind of high-power electric steering engine overcurrent protection signal high speed generating means and method |
-
2012
- 2012-04-27 CN CN 201220188294 patent/CN202623957U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426550A (en) * | 2019-08-16 | 2019-11-08 | 北京机械设备研究所 | A kind of high-power electric steering engine overcurrent protection signal high speed generating means and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |