CN113335178A - Special power-off delay type DC-DC12V10A converter for electric vehicle - Google Patents

Special power-off delay type DC-DC12V10A converter for electric vehicle Download PDF

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Publication number
CN113335178A
CN113335178A CN202110808635.4A CN202110808635A CN113335178A CN 113335178 A CN113335178 A CN 113335178A CN 202110808635 A CN202110808635 A CN 202110808635A CN 113335178 A CN113335178 A CN 113335178A
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CN
China
Prior art keywords
pin
circuit
power
control chip
delay
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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.)
Withdrawn
Application number
CN202110808635.4A
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Chinese (zh)
Inventor
马光路
董静
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Fengxian Hongxiang Electronic Technology Co ltd
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Fengxian Hongxiang Electronic Technology Co ltd
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Priority to CN202110808635.4A priority Critical patent/CN113335178A/en
Publication of CN113335178A publication Critical patent/CN113335178A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/24—Circuit arrangements for protecting against overvoltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to the technical field of automobile circuits, in particular to a special power-off delay type DC-DC12V10A converter for an electric vehicle, which comprises a main circuit, a control circuit and a power-off delay circuit, wherein the control circuit consists of a control chip, a voltage stabilizing circuit, an oscillating circuit and a pulse circuit; when the power-off delay circuit is powered off, the capacitor can slowly release electric energy through a resistor to continuously provide a conducting signal for the triode, so that the converter still keeps a working state; after the electric energy in the capacitor is released, the triode loses the conducting signal, the triode is changed from the conducting state to the cut-off state, and the converter stops working, so that the function of power-off delay is realized.

Description

Special power-off delay type DC-DC12V10A converter for electric vehicle
Technical Field
The invention relates to the technical field of automobile circuits, in particular to a special power-off delay type DC-DC12V10A converter for an electric vehicle.
Background
With the increasing demand of people for materials, the functional requirements for electric vehicles (closed tricycles and quadricycles) are also increasing. The function that just has on the high-end car all has on the electric motor car, and such electric motor car people just can like, just can accept easily. The headlight delay function (illuminating the way home) is an intelligent and humanized function. This requires the converter to have a power-off delay function, which is a technical problem to be solved.
Disclosure of Invention
The purpose of the invention is: the power-off delay type DC-DC12V10A converter special for the electric vehicle and capable of providing the headlamp delay function for the whole vehicle headlamp control system is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a power-off delay type DC-DC12V10A converter special for an electric vehicle comprises a main circuit, a control circuit and a power-off delay circuit, wherein the control circuit consists of a control chip, a voltage stabilizing circuit, an oscillating circuit and a pulse circuit, and the power-off delay circuit consists of a triode switch circuit and a resistance-capacitance delay circuit.
Further, the control chip U1 has eight pins, including the 1 st pin COMP, the 2 nd pin VFB, the 3 rd pin ISENSE, the 4 th pin RT/CT, the 5 th pin GROUND, the 6 th pin OUTPUT, the 7 th pin VCC, and the 8 th pin VREF.
Furthermore, the main circuit comprises a power supply input end and a power supply output end, the power supply input end and the power supply output end are both connected with a filter element, one path of the input power supply is connected with a VCC pin of the control chip, and the other path of the input power supply is connected with an MOS (metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor and an over-current detection resistor; the anode of the filter capacitor and the drain of the MOS tube are both connected with the anode of the input power supply; the source electrode of the MOS tube is connected with the over-current detection resistor, the MOS tube is connected with an ISENSE pin of the control chip through the over-current detection resistor, and simultaneously connected with the energy storage inductor and the Schottky diode respectively, the Schottky diode is connected with the energy storage inductor, and the other end of the energy storage inductor is connected with the output filter capacitor and the transient suppression diode respectively.
Furthermore, the voltage stabilizing circuit consists of a voltage stabilizing module, two voltage regulating resistors, an optocoupler and a load resistor, wherein the voltage stabilizing module is connected with a COMP pin and a VFB pin of the control chip.
Furthermore, the oscillation circuit consists of a resistor and a capacitor and is connected with an RT-CT pin of the control chip.
Further, the energy storage inductor is an annular energy storage inductor.
Furthermore, the model of the control chip U1 is YW/UTC 3845E.
The technical scheme adopted by the invention has the beneficial effects that:
1. the invention adopts a power-off delay circuit consisting of a triode, a resistor and a capacitor. When the power-off delay circuit is connected with a power supply, the triode is changed from a cut-off state to a conducting state (simultaneously, the capacitor is charged, and preparation is made for power-off delay), so that a working signal is provided for the converter control circuit, and the converter enters a working state; when the power-off delay circuit is powered off, the circuit cannot stop working immediately due to the charge-discharge characteristic of the capacitor, the capacitor can slowly release electric energy through a resistor and continue to provide a conducting signal for the triode, so that the converter still continues to keep a working state; after the electric energy in the capacitor is released, the triode loses the conducting signal, the triode is changed from the conducting state to the cut-off state, and the converter stops working. Therefore, the function of power-off delay is realized. The headlight delay function is also realized.
2. The main circuit can realize energy storage and output overvoltage protection, and the control circuit plays a role in voltage stabilization in the circuit.
3. One path of the input power supply is connected with a VCC pin of the control chip to provide starting voltage for the control chip, and stable +12V working voltage is output through the fast recovery diode.
4. The voltage stabilizing module is connected with a COMP pin and a VFB pin of the control chip and provides 2.5V reference voltage for the VFB pin, when the output voltage is too low or too high, the voltage stabilizing module and the two voltage regulating resistors jointly act to provide sampling voltage, and the conduction pulse width of the MOS tube is controlled after the sampling voltage is compared with the 2.5V reference voltage in the VFB pin of the control chip through optical coupling feedback, so that the output voltage is stable, and the output voltage is still not lower than 12V under the condition that the converter is fully loaded by 10A.
5. The OUTPUT pin of the control chip OUTPUTs pulses, the pulses are connected with the grid electrode of the MOS tube through a resistor to drive the MOS tube to work, and when the MOS tube is conducted, OUTPUT current is filtered by a filter capacitor to supply power to a load; when the load is short-circuited or exceeds the set maximum allowable current, the voltage of the ISENSE pin of the control chip rises, and the OUTPUT pulse of the OUTPUT pin is adjusted through the control chip, so that the MOS tube is cut off, the MOS tube is protected from being damaged, and an overcurrent protection circuit is formed; when the MOS tube is cut off, the energy storage inductor forms an energy storage circuit to convert magnetic energy into electric energy, the polarity of the electric energy is negative on the left and positive on the right, the Schottky diode is conducted to form a follow current circuit, and power is continuously supplied to the load, so that the load obtains smooth direct current; when the output voltage is higher than the set maximum allowable output voltage, the transient suppression diode is damaged by reverse breakdown to form an output overvoltage protection circuit; the output voltage of the converter is almost zero, so that the load is protected from being damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein
Fig. 1 is a circuit diagram of the present invention.
U1 is the control chip, U2 is the opto-coupler, U3 is the voltage stabilizing module, D1 is fast recovery diode, D2 is the transient suppression diode, D3 is the voltage stabilizing diode, C1-C10 are electric capacity, V1 is the MOS pipe, V2 is the schottky diode, L1 is annular energy storage inductance, R4 is control chip U1 starting resistance, R3 is the overcurrent detection resistance, R1-R16 are resistance.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention. The present invention is described in detail by using schematic structural diagrams and the like, which are only examples and should not limit the protection scope of the present invention. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
As shown in fig. 1, the complete power-off delay converter circuit is composed of three major parts, namely a main circuit, a control circuit and a power-off delay circuit. The main circuit can realize energy storage and output overvoltage protection, and the control circuit plays a role in voltage stabilization in the circuit. The power input end of the main circuit inputs DC high voltage of the storage battery pack, wherein one path is connected with one end of the R15 through a starting resistor R4, an emitting electrode of a triode Q2, a collecting electrode of the triode Q3 and a cathode of a fast recovery diode D1. The emitter of the Q3 is connected with two capacitors C2 and C4 which are connected in parallel, the capacitor is a power supply filter capacitor of a control chip U1, the anode of a fast recovery diode D1 is connected with and outputs +12V voltage, the cathode outputs +12V voltage, and stable working voltage is provided for the control chip U1; the power input end is also connected with the anode of an input power filter capacitor C9 and the drain of an MOS tube V1, and the cathode of the power filter capacitor C9 is grounded; the gate of the MOS transistor V1 is connected to the 6 th pin of the control chip U1 through a resistor R2. The source of the MOS transistor V1 is connected to the over-current detection resistor R3, and is connected to pin 3 of the control chip U1 through the over-current detection resistor R3, and is simultaneously connected to the energy storage inductor L1 and the cathode of the schottky diode V2, the schottky diode V2 is connected to the energy storage inductor L1, and the other end of the energy storage inductor L1 is connected to the anode of the power output filter capacitor C8 and the cathode of the transient suppression diode D2; the cathode of the power supply output filter capacitor C8 and the anode of the transient suppression diode D2 are grounded.
The voltage stabilizing circuit consists of a voltage stabilizing module U3, voltage regulating resistors R7, R8, an optical coupler U2 and a load resistor R10, wherein a 1 st pin of the voltage stabilizing module U3 is connected with a voltage output end of the converter after being divided by the voltage regulating resistors R8 and R7, a 2 nd pin is grounded, a 3 rd pin provides 2.5V reference voltage for a 2 nd pin of a control chip U1 through the optical coupler U2, two pins of a light receiver of the optical coupler U2 are respectively connected with the 1 st pin and the 2 nd pin of the control chip U1, one pin of a light emitter is connected with the voltage output end of the converter through the resistor R9, and the other pin is respectively connected with a capacitor C7 and the 3 rd pin of the voltage stabilizing module U3; when the output voltage is too low or too high, the voltage stabilizing module U3 and the voltage regulating resistors R7 and R8 jointly act to provide sampling voltage, and the conduction pulse width of the MOS transistor V1 is controlled after the feedback of the optical coupler U2 is compared with the 2.5V reference voltage in the 2 nd pin of the control chip U1, so that the output voltage is stable, and the output voltage is still not lower than 12V under the condition that the converter is fully loaded by 10A; the resistor R5 and the capacitor C3 form an oscillating circuit of the control chip U1 and are connected with the 4 th pin of the U1; the 6 th pin of the control chip U1 outputs pulses, which are respectively connected with the grid of the MOS tube V1 through resistors R1 and R2 to drive the MOS tube V1 to work, and when the MOS tube V1 is switched on, the output current is filtered by a filter capacitor C8 through L1 to supply power to a load; when the load is short-circuited or exceeds the set maximum allowable current, the voltage of the pin 3 of the control chip U1 rises, the output pulse of the pin 6 is adjusted through the control chip U1, the MOS tube V1 is cut off, the MOS tube V1 is protected from being damaged, and an overcurrent protection circuit is formed; when the MOS transistor V1 is cut off, the energy storage inductor L1 forms an energy storage circuit to convert magnetic energy into electric energy, the polarity of the electric energy is negative at the left and positive at the right, the Schottky diode V2 is conducted to form a follow current circuit, and power is continuously supplied to a load, so that the load obtains smooth direct current; when the output voltage is higher than the set maximum allowable output voltage, the transient suppression diode D2 is broken down in a reverse breakdown mode to form an output overvoltage protection circuit; the output voltage of the converter is almost zero, so that the load is protected from being damaged.
When a DMS port in the outage delay circuit is connected with a DC high voltage of a storage battery pack, a voltage stabilizing circuit consisting of a voltage stabilizing diode D3 and a resistor R11 provides a stable working voltage for the outage delay circuit, and a capacitor C10 serves as a filter capacitor of the voltage stabilizing circuit and a delay element of the outage delay circuit on one hand, and a capacitor C10 starts to charge to prepare for outage delay. The base of the transistor Q1 is connected through a resistor R12, and a base lower bias resistor R13, and the emitter of the transistor Q1 is grounded. The transistor Q1 thus receives a high signal, which changes from off to on. The base of the triode Q2 is connected through the collector resistor R14 of the triode Q1 and the upper bias resistor R15 of the triode Q2, so that the triode Q2 obtains a low-level signal and is changed into a conducting state from a cut-off state. The collector of the triode Q2 is grounded through the R16, and the base of the triode Q3 is connected to the collector of the triode Q2, so that the triode Q3 obtains a high-level signal and changes from a cut-off state to a conducting state. The emitter of the triode Q3 is connected with the 7 th pin of the control chip U1, the collector is connected with the starting resistor R4 of the control chip U1, the controller chip U1 obtains a starting signal from the starting resistor R4, and the converter enters the working state.
When the DMS port in the outage delay circuit disconnects the DC high voltage of the battery pack, the circuit does not immediately stop working due to the charging and discharging characteristics of the capacitor C10. The capacitor C10 will continue to provide power to the power-off delay circuit through the discharge resistor R12, so that the converter still continues to operate. After the electric energy stored in the capacitor C10 is released over time, the transistor Q1 obtains a low level signal from the capacitor C10, and the low level signal changes from the on state to the off state, and then the transistors Q2 and Q3 also change from the on state to the off state, so that the converter control circuit loses the working signal, and the converter stops working. Therefore, the function of power-off delay is realized. The headlight delay function is also realized.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The utility model provides a dedicated outage time delay type DC-DC12V10A converter of electric motor car which characterized in that: the power-off delay circuit comprises a main circuit, a control circuit and a power-off delay circuit, wherein the control circuit consists of a control chip, a voltage stabilizing circuit, an oscillating circuit and a pulse circuit, and the power-off delay circuit consists of a triode switch circuit and a resistance-capacitance delay circuit.
2. The power-off delay type DC-DC12V10A converter special for the electric vehicle according to claim 1, wherein: the control chip U1 is provided with eight pins including a 1 st pin COMP, a 2 nd pin VFB, a 3 rd pin ISENSE, a 4 th pin RT/CT, a 5 th pin GROUND, a 6 th pin OUTPUT, a 7 th pin VCC and an 8 th pin VREF.
3. The power-off delay type DC-DC12V10A converter special for the electric vehicle as claimed in claim 2, wherein: the main circuit comprises a power supply input end and a power supply output end, the power supply input end and the power supply output end are both connected with a filter element, one path of an input power supply is connected with a VCC pin of a control chip, and the other path of the input power supply is connected with an MOS (metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor and an over-current detection resistor; the anode of the filter capacitor and the drain of the MOS tube are both connected with the anode of the input power supply; the source electrode of the MOS tube is connected with the over-current detection resistor, the MOS tube is connected with an ISENSE pin of the control chip through the over-current detection resistor, and simultaneously connected with the energy storage inductor and the Schottky diode respectively, the Schottky diode is connected with the energy storage inductor, and the other end of the energy storage inductor is connected with the output filter capacitor and the transient suppression diode respectively.
4. The power-off delay type DC-DC12V10A converter special for the electric vehicle according to claim 3, wherein: the voltage stabilizing circuit consists of a voltage stabilizing module, two voltage regulating resistors, an optical coupler and a load resistor, wherein the voltage stabilizing module is connected with a COMP pin and a VFB pin of the control chip.
5. The power-off delay type DC-DC12V10A converter special for the electric vehicle according to claim 4, wherein: the oscillating circuit consists of a resistor and a capacitor and is connected with an RT-CT pin of the control chip.
6. The power-off delay type DC-DC12V10A converter special for the electric vehicle according to claim 5, wherein: and an OUTPUT pin of the control chip is connected with a grid electrode of the MOS tube through a resistor.
7. The power-off delay type DC-DC12V10A converter special for the electric vehicle as claimed in claim 6, wherein: the energy storage inductor is an annular energy storage inductor.
8. The power-off delay type DC-DC12V10A converter special for the electric vehicle according to claim 7, wherein: the model of the control chip U1 is YW/UTC 3845E.
CN202110808635.4A 2021-07-16 2021-07-16 Special power-off delay type DC-DC12V10A converter for electric vehicle Withdrawn CN113335178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110808635.4A CN113335178A (en) 2021-07-16 2021-07-16 Special power-off delay type DC-DC12V10A converter for electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110808635.4A CN113335178A (en) 2021-07-16 2021-07-16 Special power-off delay type DC-DC12V10A converter for electric vehicle

Publications (1)

Publication Number Publication Date
CN113335178A true CN113335178A (en) 2021-09-03

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CN202110808635.4A Withdrawn CN113335178A (en) 2021-07-16 2021-07-16 Special power-off delay type DC-DC12V10A converter for electric vehicle

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