CN219960880U - Enabling control circuit based on discrete device - Google Patents
Enabling control circuit based on discrete device Download PDFInfo
- Publication number
- CN219960880U CN219960880U CN202320940483.8U CN202320940483U CN219960880U CN 219960880 U CN219960880 U CN 219960880U CN 202320940483 U CN202320940483 U CN 202320940483U CN 219960880 U CN219960880 U CN 219960880U
- Authority
- CN
- China
- Prior art keywords
- voltage
- triode
- resistor
- diode
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 9
- 230000009191 jumping Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
The utility model relates to an enabling control circuit based on a discrete device. The high-voltage power supply comprises an enabling control circuit and a DCDC control chip, wherein the enabling control circuit comprises a first voltage stabilizing diode Z1, a second voltage stabilizing diode Z2, a first diode D1, a second diode D2, a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2 and a third resistor R3; the starting and closing voltage of the enabling signal is separated and identified through the discrete device of the enabling control circuit, the original single critical point is separated into two, namely the starting critical point and the closing critical point, so that the problem of voltage critical point jitter is solved.
Description
Technical Field
The utility model relates to a car lamp control circuit, in particular to an enabling control circuit based on discrete devices.
Background
As the electrification degree of automobiles increases, LED lamps are becoming more popular, and LED lamps are being used in large quantities on commercial trucks with 24V electrical systems. For some higher power fixtures, such as headlamps, a more efficient DCDC circuit is often used as a driving scheme. The electric use voltage range of the commercial vehicle is 18-32V, namely, when the voltage condition is lower than 18V, the commercial vehicle is allowed to be not operated, because the input voltage of the DCDC circuit is inversely proportional to the current, under the condition of the same load, the smaller the input voltage is, the larger the input current is, and under the condition of the normal voltage of 18-32V of the commercial vehicle headlight, the current is large, if the current is possibly doubled even under the condition of low-voltage power supply, an enabling circuit is usually used for protecting the DCDC circuit from low-voltage turn-off, and the damage to front-end input components is avoided due to the fact that the current is too large under the condition of low-voltage.
At present, there are two general methods for low-voltage shutdown protection:
scheme A: and a voltage stabilizing tube is connected in series between the power supply signal and the enabling of the driving circuit, when the power supply voltage is lower than the sum of the voltage stabilizing tube and the enabling threshold value of the driving circuit, the enabling signal is invalid, and the driving circuit enters a closed state. The scheme has the advantages of simple circuit and low cost, but the problem of fuzzy jitter of the starting voltage critical point exists because the input voltage signal is an analog signal. Typically used on low power linear drive circuits. If used in high power DCDC driving circuits, the DCDC chip may shake between on and off at the threshold voltage, possibly entering an abnormal operation state and even causing element damage.
Scheme B: the singlechip is used for monitoring the power supply voltage in real time, and the drive circuit is directly enabled to be controlled through the IO port of the singlechip. The scheme has the advantages that the digital signal is controlled and enabled, and the problem of blurring of critical points is avoided. The disadvantage of this solution is also evident, the cost of the device is relatively high.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide an enabling control circuit based on a discrete device, which can avoid voltage critical point jitter at a lower cost.
The utility model is realized in the following way: an enabling control circuit based on discrete devices comprises an enabling control circuit and a DCDC control chip, wherein the enabling control circuit comprises a first voltage stabilizing diode Z1, a second voltage stabilizing diode Z2, a first diode D1, a second diode D2, a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2 and a third resistor R3;
the cathode of the first zener diode Z1 is connected with one end of the third resistor R3 and is connected with a power supply voltage input end Vbat, the other end of the third resistor R3 is respectively connected with the anode of the first diode D1 and the cathode of the second zener diode Z2, and the anode of the second zener diode Z2 is connected with the base electrode of the third triode Q3; the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2 and the collector of the second triode Q2; the anode of the second diode D2 is connected with the base electrode of the first triode Q3; the emitter of the first triode Q3 is connected with a +5V voltage end, and the collector of the first triode Q3 is connected to an EN pin of the DCDC control chip;
the emitter of the second diode Q2 is grounded, the base of the second diode Q2 is respectively connected with one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected with the positive electrode of the first zener diode Z1, the other end of the second resistor R2 is connected with the collector of the third triode Q3, and the emitter of the third triode Q3 is grounded.
The first triode Q1 is a PNP triode, and the second triode Q2 and the third triode Q3 are NPN triodes respectively.
Setting the voltage between the third resistor R3 and the second voltage stabilizing tube Z2 and the voltage between the third resistor R3 and the first diode D1 as a first voltage V1, the voltage at one end of the base electrode of the second triode Q2 as a second voltage V2, the voltage at one end of the base electrode of the third triode Q3 as a third voltage V3, and the voltage at one end of the base electrode of the first triode Q1 as a fourth voltage V4; when the second voltage V2 is 1.4V, the second triode Q2 is turned on and off by a critical value; when the third voltage V3 is 1.4V, the third triode Q3 is turned on and off by a critical value; the first zener diode Z1 and the second zener diode Z2 are in a nominal value as a conducting voltage; the EN signal is active high.
When the supply voltage of the supply voltage input end Vbat rises from 0V to 5.1V, the second zener diode Z2 starts to be turned on; when the supply voltage of the supply voltage input end Vbat continues to rise to 7.2V, the third voltage V3 is 1.4V, and at this time, the first triode Q1 starts to be turned on; when the power supply voltage of the power supply voltage input end Vbat continuously rises to 10V, the first zener diode Z1 is conducted; when the power supply voltage of the power supply voltage input end Vbat rises to 12.8V, the partial voltage at the second voltage V2 is 1.4V, and the second triode Q2 is conducted; enabling the turn-on voltage.
When the supply voltage of the supply voltage input terminal Vbat is 12.1V, the off voltage is enabled.
The beneficial effects of the utility model are as follows: the starting and closing voltage of the enabling signal is separated and identified through the discrete device of the enabling control circuit, the original single critical point is separated into two, namely the starting critical point and the closing critical point, so that the problem of voltage critical point jitter is solved. The utility model solves the problem of jitter of the threshold point of the turn-on and turn-off voltage of the single zener diode enabling scheme with lower cost.
Drawings
Fig. 1 is a schematic circuit structure of the present utility model.
Wherein: 1. enabling the control circuit; 2. DCDC control chip.
Detailed Description
According to fig. 1, the utility model provides an enabling control circuit based on discrete devices, which comprises an enabling control circuit 1 and a DCDC control chip 2, wherein the enabling control circuit comprises a first zener diode Z1, a second zener diode Z2, a first diode D1, a second diode D2, a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2 and a third resistor R3.
The cathode of the first zener diode Z1 is connected with one end of the third resistor R3 and is connected with a power supply voltage input end Vbat, the other end of the third resistor R3 is respectively connected with the anode of the first diode D1 and the cathode of the second zener diode Z2, and the anode of the second zener diode Z2 is connected with the base electrode of the third triode Q3; the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2 and the collector of the second triode Q2; the anode of the second diode D2 is connected with the base electrode of the first triode Q3; the emitter of the first triode Q3 is connected with a +5V voltage end, and the collector of the first triode Q3 is connected to an EN pin of the DCDC control chip;
the emitter of the second diode Q2 is grounded, the base of the second diode Q2 is respectively connected with one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected with the positive electrode of the first zener diode Z1, the other end of the second resistor R2 is connected with the collector of the third triode Q3, and the emitter of the third triode Q3 is grounded.
The first triode Q1 is a PNP triode, and the second triode Q2 and the third triode Q3 are NPN triodes respectively.
Setting the voltage between the third resistor R3 and the second voltage stabilizing tube Z2 and the voltage between the third resistor R3 and the first diode D1 as a first voltage V1, the voltage at one end of the base electrode of the second triode Q2 as a second voltage V2, the voltage at one end of the base electrode of the third triode Q3 as a third voltage V3, and the voltage at one end of the base electrode of the first triode Q1 as a fourth voltage V4; when the second voltage V2 is 1.4V, the second triode Q2 is turned on and off by a critical value; when the third voltage V3 is 1.4V, the third triode Q3 is turned on and off by a critical value; the first zener diode Z1 and the second zener diode Z2 are in a nominal value as a conducting voltage; the EN signal is active high.
The DCDC control chip 2 may be a control chip manufactured by TI company and having a model number TPS 92692.
1. Enable on threshold voltage value
The supply voltage of the supply voltage input terminal Vbat starts to be boosted from 0V, and at 0V, all the devices of the enable control circuit 1 are not in a conducting state.
When the supply voltage of the supply voltage input end Vbat rises from 0V to 5.1V, the second zener diode Z2 starts to be turned on; when the supply voltage of the supply voltage input end Vbat continues to rise to 7.2V, the third voltage V3 is 1.4V, and at this time, the first triode Q1 starts to be turned on; when the power supply voltage of the power supply voltage input end Vbat continuously rises to 10V, the first zener diode Z1 is conducted; when the supply voltage of the supply voltage input end Vbat rises to 12.8V, the voltage division at the second voltage V2 is 1.4V, and the second triode Q2 is turned on. Since the second triode Q2 is turned on, the second diode D2 is turned on to ground, the fourth voltage V4 is pulled low, the first triode Q1 is turned on, and the EN signal is valid; meanwhile, the first diode D1 is also in a state of conducting to the ground, the first voltage V1 is pulled down to 0.7V from 12.8V, the second zener diode Z2 is turned off, the third voltage V3 is 0V, the third triode Q3 is turned off, the second resistor R2 does not act on the voltage at the second voltage V2 due to the cut-off of the third triode Q3, the voltage of the second voltage V2 is raised, the voltage jumps from 1.4V to about 1.85V, the voltage of the second voltage V2 jumps from the conduction critical point of the second triode Q2, and the conduction of the second triode Q2 is stable; at this time, the first zener diode Z1, the first resistor R1, the second transistor Q2, the first diode D1, the second diode D2 and the first transistor Q1 are in a conductive state, the second zener diode Z2, the third transistor Q3 and the second resistor R2 are in a non-conductive state, the EN signal is active high, and 12.8V is identified as the enable-on voltage.
2. Enable off threshold voltage value
The supply voltage of the supply voltage input terminal Vbat starts to drop from 18V.
When the supply voltage of the supply voltage input end Vbat is 18V, according to the analysis and description of the enable turn-on voltage, the first zener diode Z1, the first resistor R1, the second triode Q2, the first diode D1, the second diode D2 and the first triode Q1 are in a conducting state, the second zener diode Z2, the third zener triode Q3 and the second resistor R2 are in a non-conducting state, and the EN signal is valid at a high level; since the third transistor Q3 is turned off, the second resistor R2 does not participate in voltage division, and the voltage of the second voltage V2= (18-10-0.7)/2=3.65V;
when the power supply voltage of the power supply voltage input end Vbat is reduced from 18V to 12.1V, the voltage of the second voltage V2 is reduced from 3.65V to 1.4V, the second transistor Q2 is a turn-off critical point of the second transistor Q2, the second transistor Q2 is turned off, the second diode D2 is turned off, the first transistor Q1 is turned off, and the EN signal is low; meanwhile, the first diode D1 enters a non-conducting state, the second zener diode Z2 enters a conducting state, the third voltage V3 is changed from 0V to 3V, the third triode Q3 enters a conducting state, the second resistor R2 is conducted, the voltage division effect is carried out on the second voltage V2, the second voltage V2 is changed from 1.4V to 1.05V in a jumping mode, the second voltage V2 is deviated from the cut-off critical point of the second triode Q2 in a voltage jumping mode, and the second triode Q2 is cut-off stably. A supply voltage of 12.1V at the supply voltage input Vbat is identified as an enable off voltage.
The utility model separates and identifies the opening and closing voltage of the enabling signal through the discrete device of the enabling control circuit, and splits the original single critical point into two, namely the opening critical point and the closing critical point, thereby solving the problem of jitter of the voltage critical point.
Claims (5)
1. An enabling control circuit based on discrete devices, characterized in that: the high-voltage power supply comprises an enabling control circuit and a DCDC control chip, wherein the enabling control circuit comprises a first zener diode Z1, a second zener diode Z2, a first diode D1, a second diode D2, a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2 and a third resistor R3;
the cathode of the first zener diode Z1 is connected with one end of the third resistor R3 and is connected with a power supply voltage input end Vbat, the other end of the third resistor R3 is respectively connected with the anode of the first diode D1 and the cathode of the second zener diode Z2, and the anode of the second zener diode Z2 is connected with the base electrode of the third triode Q3; the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2 and the collector of the second triode Q2; the anode of the second diode D2 is connected with the base electrode of the first triode Q3; the emitter of the first triode Q3 is connected with a +5V voltage end, and the collector of the first triode Q3 is connected to an EN pin of the DCDC control chip;
the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is respectively connected with one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected with the positive electrode of the first zener diode Z1, the other end of the second resistor R2 is connected with the collector of the third triode Q3, and the emitter of the third triode Q3 is grounded.
2. The discrete device-based enabling control circuit of claim 1, wherein: the first triode Q1 is a PNP triode, and the second triode Q2 and the third triode Q3 are NPN triodes respectively.
3. The discrete device-based enabling control circuit of claim 1, wherein: setting the voltage between the third resistor R3 and the second voltage stabilizing tube Z2 and the voltage between the third resistor R3 and the first diode D1 as a first voltage V1, the voltage at one end of the base electrode of the second triode Q2 as a second voltage V2, the voltage at one end of the base electrode of the third triode Q3 as a third voltage V3, and the voltage at one end of the base electrode of the first triode Q1 as a fourth voltage V4; when the second voltage V2 is 1.4V, the second triode Q2 is turned on and off by a critical value; when the third voltage V3 is 1.4V, the third triode Q3 is turned on and off by a critical value; the first zener diode Z1 and the second zener diode Z2 are in a nominal value as a conducting voltage; the EN signal is active high.
4. A discrete device based enable control circuit as claimed in claim 3, wherein: when the supply voltage of the supply voltage input end Vbat rises from 0V to 5.1V, the second zener diode Z2 starts to be turned on; when the supply voltage of the supply voltage input end Vbat continues to rise to 7.2V, the third voltage V3 is 1.4V, and at this time, the first triode Q1 starts to be turned on; when the power supply voltage of the power supply voltage input end Vbat continuously rises to 10V, the first zener diode Z1 is conducted; when the power supply voltage of the power supply voltage input end Vbat rises to 12.8V, the partial voltage at the second voltage V2 is 1.4V, and the second triode Q2 is conducted; enabling the turn-on voltage.
5. A discrete device based enable control circuit as claimed in claim 3, wherein: when the supply voltage of the supply voltage input terminal Vbat is 12.1V, the off voltage is enabled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320940483.8U CN219960880U (en) | 2023-04-24 | 2023-04-24 | Enabling control circuit based on discrete device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320940483.8U CN219960880U (en) | 2023-04-24 | 2023-04-24 | Enabling control circuit based on discrete device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219960880U true CN219960880U (en) | 2023-11-03 |
Family
ID=88541190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320940483.8U Active CN219960880U (en) | 2023-04-24 | 2023-04-24 | Enabling control circuit based on discrete device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219960880U (en) |
-
2023
- 2023-04-24 CN CN202320940483.8U patent/CN219960880U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104427721A (en) | Led drive circuit | |
| CN110190840B (en) | Control device | |
| CN209994110U (en) | NMOS tube-based reverse connection prevention protection circuit for vehicle-mounted direct-current power supply | |
| CN219960880U (en) | Enabling control circuit based on discrete device | |
| CN208285214U (en) | A kind of stagnant ring driving device of low-power consumption | |
| CN111130321A (en) | Single-power-supply negative-voltage power switch tube driving circuit | |
| CN116449088A (en) | Transient test circuit for realizing rapid jump of input voltage | |
| CN114801976A (en) | Far and near light lamp control circuit | |
| CN113079610B (en) | Control circuit, control chip and power supply system | |
| US11901887B2 (en) | Switch device | |
| CN218526236U (en) | Controllable wide voltage linear voltage-stabilized power supply of chronogenesis | |
| CN217388212U (en) | Controller auxiliary power supply protection device | |
| CN220754344U (en) | Short-circuit protection circuit suitable for buck controller | |
| CN217883905U (en) | Single-pole PFC stroboscopic removing circuit capable of being completely turned off | |
| CN218997931U (en) | Quick power-on and power-off circuit | |
| CN220858080U (en) | High-reliability multiplex electronic relay | |
| CN216356087U (en) | Three-power-supply automatic switching circuit | |
| CN117118032B (en) | Battery reverse connection preventing circuit and battery reverse connection preventing system | |
| CN217087506U (en) | Load driving circuit, PCB and electronic device | |
| CN217214586U (en) | Electronic relay with protection function | |
| CN216057579U (en) | Heavy current control circuit based on rain-proof short circuit interference | |
| CN220965221U (en) | Dipped headlight temperature protection circuit | |
| CN210578471U (en) | Overvoltage protection circuit | |
| CN218867909U (en) | Short-circuit protection circuit, port power supply and electronic equipment | |
| CN220985374U (en) | Dual-power supply circuit, electronic circuit and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |