CN213426025U - Vehicle-mounted navigation control power supply - Google Patents
Vehicle-mounted navigation control power supply Download PDFInfo
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- CN213426025U CN213426025U CN202022158735.0U CN202022158735U CN213426025U CN 213426025 U CN213426025 U CN 213426025U CN 202022158735 U CN202022158735 U CN 202022158735U CN 213426025 U CN213426025 U CN 213426025U
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 52
- 238000001514 detection method Methods 0.000 claims description 19
- 238000004146 energy storage Methods 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The utility model provides a vehicle navigation control power supply, which can absorb subtraction pulse generated at the moment of switching on and off of a switch tube in a BOOST circuit by arranging an RCD absorption circuit, thereby reducing the loss of the system; through setting up buffer circuit, can alleviate because the influence of vehicle navigation start-up impact current to the BOOST circuit in the twinkling of an eye, the protection system suppresses spike pulse simultaneously, reduces the loss.
Description
Technical Field
The utility model relates to a vehicle navigation technical field especially relates to a vehicle navigation control power.
Background
The switching power supply required for vehicle navigation requires a large fluctuation range of normal operating voltage and a stable output voltage. Currently, a vehicle navigation power supply includes a linear voltage-stabilized power supply, a step-down switching voltage-stabilized power supply, and a step-up switching voltage-stabilized power supply. The utility model relates to a vehicle navigation power is BOOST type switching regulator power supply, often adopts the BOOST circuit to BOOST, and it has the characteristics of power disturbance is little, high efficiency and small volume, but its output ripple coefficient is big to in the twinkling of an eye at switching power supply start, stop etc. state, easily cause spike. Therefore, for solving the above problem, the utility model provides a vehicle navigation control power supply can effectively restrain spike pulse, reduces the loss, raises the efficiency.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a vehicle navigation control power supply can effectively restrain spike pulse, reduces the loss, raises the efficiency.
The technical scheme of the utility model is realized like this: the utility model provides a vehicle navigation control power, it includes switch boost circuit and control circuit, and switch boost circuit includes: the circuit comprises an energy storage circuit, a BOOST circuit, an RCD absorption circuit and a buffer circuit;
the power supply is electrically connected with the input end of the BOOST circuit through the energy storage circuit, the sampling end of the energy storage circuit is electrically connected with the current feedback of the control circuit, the control end of the BOOST circuit is electrically connected with the analog output end of the control circuit respectively, the output end of the BOOST circuit supplies power to a load through the buffer circuit, and the RCD absorption circuit is connected between the input end of the BOOST circuit and the output end of the BOOST circuit in parallel.
On the basis of the above technical solution, preferably, the control circuit includes a current detection circuit, a processor and a totem-pole circuit;
the input end of the current detection circuit is electrically connected with the sampling end of the energy storage circuit, the output end of the current detection circuit is electrically connected with the current feedback of the processor, the analog output end of the processor is electrically connected with the input end of the totem-pole circuit, and the output end of the totem-pole circuit is electrically connected with the control end of the BOOST circuit.
Further preferably, the energy storage circuit comprises an inductor L3 and a transformer T1;
the positive pole of the power supply is electrically connected with one end of the primary side of the transformer T1 through the inductor L3, the other end of the primary side of the transformer T1 is electrically connected with the input end of the BOOST circuit, one end of the secondary side of the transformer T1 is grounded, and the other end of the secondary side of the transformer T1 is electrically connected with the input end of the current detection circuit.
Further preferably, the BOOST circuit comprises a diode D2, a capacitor C5 and a MOS transistor Q2;
the other end of the primary side of the transformer T1 is electrically connected with the anode of the diode D2 and the drain of the MOS tube Q2 respectively, the cathode of the diode D2 is electrically connected with one end of the capacitor C5 and the input end of the buffer circuit respectively, the other end of the capacitor C5 and the source of the MOS tube Q2 are both grounded, and the gate of the MOS tube Q2 is electrically connected with the output end of the totem-pole circuit.
Further preferably, the RCD snubber circuit includes: a resistor R19, a capacitor C14 and a diode D1;
the anode of the diode D1 is electrically connected with the anode of the diode D2, the cathode of the diode D1 is electrically connected with the cathode of the diode D2, and the capacitor C14 and the resistor R19 are connected in series and then connected in parallel between the anode and the cathode of the diode D1.
Further preferably, the buffer circuit comprises a resistor R20, a thermistor R21, an electrolytic capacitor C15, an electrolytic capacitor C16, a capacitor C3, a diode D4, a diode D5 and a relay K1;
the output end of the BOOST circuit is electrically connected with one end of a resistor R20 and the anode of an electrolytic capacitor C15 respectively, the other end of a thermistor R20 is electrically connected with the anode of an electrolytic capacitor C16, the cathode of the electrolytic capacitor C15 and the cathode of an electrolytic capacitor C16 are electrically connected with one end of a thermistor R21 and one end of a capacitor C3 respectively, the other end of the capacitor C3 outputs a power supply voltage, the other end of a thermistor R21 is electrically connected with the cathode of a power supply, a diode D4 is reversely connected in parallel at two ends of a thermistor R21, two normally open contacts of a relay K1 are connected in parallel at two ends of a thermistor R21, one end of a coil of a relay K1 is electrically connected with the cathode of the power supply, and the other end of the coil of the relay K1 is electrically connected with.
On the basis of the above technical solution, preferably, the control circuit further includes: an output voltage acquisition circuit;
the input end of the output voltage acquisition circuit is electrically connected with the output end of the buffer circuit, and the output end of the output voltage acquisition circuit is electrically connected with the voltage detection end of the processor.
The utility model discloses a vehicle navigation control power has following beneficial effect for prior art:
(1) by arranging the RCD absorption circuit, subtraction pulses generated at the moment of switching on and switching off of a switch tube in the BOOST circuit can be absorbed, and the loss of the system is reduced;
(2) by arranging the buffer circuit, the influence of the instantaneous impact current of the vehicle navigation starting-up on the BOOST circuit can be relieved, the system is protected, meanwhile, the spike pulse is inhibited, and the loss is reduced;
(3) through set up thermistor R21 and parallelly connected relay K1 at thermistor both ends in buffer circuit, through thermistor R21 according to impulse current size dynamic adjustment circuit in the resistance size, make diode D2 in the BOOST circuit can not receive impulse current's influence, play the effect of buffering, and after the vehicle navigation start is normal, through electrifying for relay K1, make the normally open contact of parallelly connected at thermistor R21 both ends closed, the electric current exports the power negative pole through the normally open contact that closes, thermistor R21 short circuit, reduce the loss that thermistor R21 brought, raise the efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a structural diagram of a vehicle navigation control power supply of the present invention;
fig. 2 is a circuit diagram of a switching boost circuit in the vehicle navigation control power supply of the present invention;
fig. 3 is a circuit diagram of a current detection circuit, a processor and a totem-pole circuit in the vehicle-mounted navigation control power supply of the present invention;
fig. 4 is a circuit diagram of the output voltage acquisition circuit in the vehicle navigation control power supply of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in FIG. 1, the utility model discloses a vehicle navigation control power supply, it includes switch boost circuit and control circuit.
And the switch boosting circuit is used for boosting the input voltage. In this embodiment, the switching boost circuit includes: the circuit comprises a tank circuit, a BOOST circuit, an RCD absorption circuit and a buffer circuit.
And the control circuit detects current and voltage signals in the line in real time and performs switching control on the switching boost circuit. In this embodiment, the control circuit includes a current detection circuit, a processor, a totem-pole circuit, and an output voltage acquisition circuit. The processor selects an IR1155 chip; the circuit structure of the current detection circuit may preferably be the structure shown in fig. 3, for detecting the current in the line, the processor compares the current with the reference current, and adjusts the amplitude and shape of the input current according to the comparison result, thereby forming a current loop; the circuit structure of the output voltage acquisition circuit can be preferably the structure shown in fig. 4, and is used for acquiring the output voltage of the BOOST circuit, and the processor adjusts the duty ratio of a signal for driving the totem-pole circuit according to the magnitude of the output voltage, so that the output voltage of the BOOST circuit is ensured to be stable, and a voltage ring is formed; the circuit structure of the totem-pole circuit may preferably be the structure shown in fig. 3, which drives the on and off times of the BOOST circuit according to the control signal out1 output by the processor; the current loop and the voltage loop are adopted to adjust the voltage, so that the amplitude and the shape of the input current can be controlled while the output voltage is stabilized.
The input end of the current detection circuit is electrically connected with the sampling end of the energy storage circuit, the output end of the current detection circuit is electrically connected with the current feedback of the processor, the simulation output end of the processor is electrically connected with the input end of the totem-pole circuit, the output end of the totem-pole circuit is electrically connected with the control end of the BOOST circuit, the input end of the output voltage acquisition circuit is electrically connected with the output end of the buffer circuit, and the output end of the output voltage acquisition circuit is electrically connected with the voltage detection end of the processor.
The energy storage circuit utilizes the inductor to store energy when the power supply is closed, so that the current in the circuit linearly rises, and the energy required by the load is provided by the stored energy of the output capacitor in the switch off state in the previous period; when the power supply is disconnected, the inductor supplies energy to the load, and the output capacitor stores energy. In this embodiment, the input terminal of the energy storage circuit is electrically connected to the positive electrode of the power supply, the output terminal of the energy storage circuit is electrically connected to the input terminal of the BOOST circuit, and the output terminal of the energy storage circuit is electrically connected to the current feedback of the control circuit. Preferably, as shown in fig. 2, the tank circuit includes an inductor L3 and a transformer T1; specifically, the positive electrode of the power supply is electrically connected to one end of the primary side of the transformer T1 through the inductor L3, the other end of the primary side of the transformer T1 is electrically connected to the input terminal of the BOOST circuit, one end of the secondary side of the transformer T1 is grounded, and the other end of the secondary side of the transformer T1 is electrically connected to the input terminal of the current detection circuit. In this embodiment, the current signal collected by the transformer T1 is represented by I1.
The inductor L3 is an energy storage inductor, stores energy when the power supply is closed, and provides electric energy for the load when the power supply is disconnected; the current in the line can be obtained by detecting the current of the secondary side of the transformer T1, and the other end of the secondary side of the transformer T1 is the adoption end of the energy storage circuit.
And the BOOST circuit is used for boosting the input voltage. In this embodiment, the power supply is electrically connected to the input terminal of the BOOST circuit through the energy storage circuit, the control terminal of the BOOST circuit is electrically connected to the analog output terminal of the control circuit, and the output terminal of the BOOST circuit supplies power to the load through the buffer circuit. Preferably, as shown in fig. 2, the BOOST circuit includes a diode D2, a capacitor C5, and a MOS transistor Q2; specifically, the other end of the primary side of the transformer T1 is electrically connected to the anode of the diode D2 and the drain of the MOS transistor Q2, the cathode of the diode D2 is electrically connected to one end of the capacitor C5 and the input of the buffer circuit, the other end of the capacitor C5 and the source of the MOS transistor Q2 are both grounded, and the gate of the MOS transistor Q2 is electrically connected to the output of the totem-pole circuit.
The capacitor C5 is an output capacitor of the BOOST circuit; diode D2 freewheel diode, which is also the output diode of the BOOST circuit; when the MOS transistor Q2 is conducted, the inductor L3 starts to store energy, the current in the line rises linearly, and at the moment, the load is supplied with power by the energy stored by the capacitor C5; when the MOS transistor Q2 is turned off, no current flows through the branch where the MOS transistor Q2 is located, an induced voltage is generated at two ends of the inductor L3, the induced voltage and a power supply are superposed to supply power to a load, voltage boosting is achieved, energy is stored in the capacitor C3, and the current flowing through the diode D2 is equal to the inductor current.
And the RCD absorption circuit is used for absorbing subtraction pulses generated at the moment of switching on and switching off of a switching tube in the BOOST circuit, and reducing the loss of the system. In this embodiment, the RCD snubber circuit is connected in parallel between the input terminal and the output terminal of the BOOST circuit. The RCD absorption circuit can be implemented by using the prior art, and in the prior art, as shown in fig. 2, the RCD absorption circuit includes: a resistor R19, a capacitor C14 and a diode D1; specifically, the anode of the diode D1 is electrically connected to the anode of the diode D2, the cathode of the diode D1 is electrically connected to the cathode of the diode D2, and the capacitor C14 and the resistor R19 are connected in series and then connected in parallel between the anode and the cathode of the diode D1.
The buffer circuit is arranged to buffer the circuit in order to protect the output diode of the BOOST circuit because the instantaneous impact current of the vehicle navigation starting is very large. In the embodiment, as shown in fig. 2, the snubber circuit includes a resistor R20, a thermistor R21, an electrolytic capacitor C15, an electrolytic capacitor C16, a capacitor C3, a diode D4, a diode D5, and a relay K1; specifically, the output end of the BOOST circuit is electrically connected with one end of a resistor R20 and the anode of an electrolytic capacitor C15, the other end of a thermistor R20 is electrically connected with the anode of the electrolytic capacitor C16, the cathode of the electrolytic capacitor C15 and the cathode of an electrolytic capacitor C16 are electrically connected with one end of a thermistor R21 and one end of a capacitor C3, the other end of the capacitor C3 outputs a load supply voltage, the other end of the thermistor R21 is electrically connected with the cathode of a power supply, a diode D4 is reversely connected in parallel at two ends of the thermistor R21, two normally open contacts of a relay K1 are connected in parallel at two ends of the thermistor R21, one end of a coil of the relay K1 is electrically connected with the cathode of the power supply, and the other end of the coil of the relay K1 is electrically connected with the analog output end of the. Wherein Vboost represents an output signal of the buffer circuit; the current used to power the coil of relay K1 is represented by I2 and may be an analog signal provided by a processor or a current signal provided directly from a power source.
The temperature in the circuit is higher as the impact current generated at the moment of starting the electronic device is larger, so that the thermistor R21 is arranged, the resistance value of the thermistor changes according to the temperature, the effect of dynamically adjusting the resistance value in the circuit according to the impact current is achieved, the diode D2 in the BOOST circuit is not affected by the impact current, and the buffering effect is achieved; however, since the thermistor R21 is worn when the car navigation system is normally turned on, the relay K1 is connected in parallel to both ends of the thermistor R21, and the thermistor R21 is short-circuited after the thermistor R21 performs buffering. The diode D4 and the diode D5 are used for shunting the reverse current flowing in the electrolytic capacitor C15 and the electrolytic capacitor C16, so that the relay is prevented from being failed, and the reliability of the buffer circuit is improved.
The working principle of the embodiment is as follows: when the processor controls the MOS tube Q2 to be conducted through the totem-pole circuit, the inductor L3 starts to store energy, the current in the circuit linearly rises, and at the moment, the load is stored by the capacitor C5 to supply power; when the processor controls the MOS tube Q2 to be cut off through the totem-pole circuit, no current flows through the branch where the MOS tube Q2 is located, inductive voltage is generated at two ends of the inductor L3, the inductive voltage and a power supply are superposed to supply power to a load, boosting is achieved, and the capacitor C5 stores energy. During this period, RCD snubber circuit, current detection circuit, output voltage acquisition circuit and buffer circuit real-time work, specifically: the RCD absorption circuit absorbs spike pulses generated at the moment when the MOS transistor Q2 is switched on and off; the thermistor R21 in the buffer circuit dynamically adjusts the resistance value in the circuit according to the impact current, so that the diode D2 in the BOOST circuit is not influenced by the impact current and plays a role in buffering, and after the vehicle navigation is started normally, the thermistor R21 can not play a role in buffering and can generate loss, at the moment, the normally open contacts connected in parallel with the two ends of the thermistor R21 are closed by electrifying the relay K1, the current is output to the negative pole of the power supply through the closed normally open contacts, and the thermistor R21 is short-circuited; the transformer T1 detects the current signal in the line, and the current signal is input to the processor through the current detection circuit, the processor compares the current with the reference current, and adjusts the amplitude and the shape of the input current according to the comparison result, so as to form a current loop; meanwhile, the output voltage of the buffer circuit is acquired in real time through the output voltage acquisition circuit, and the duty ratio of a signal for driving the totem-pole circuit is adjusted by the processor according to the output voltage, so that the output voltage of the BOOST circuit is stable, and a voltage loop is formed;
the beneficial effect of this embodiment does: by arranging the RCD absorption circuit, subtraction pulses generated at the moment of switching on and switching off of a switch tube in the BOOST circuit can be absorbed, and the loss of the system is reduced;
by arranging the buffer circuit, the influence of the instantaneous impact current of the vehicle navigation starting-up on the BOOST circuit can be relieved, the system is protected, meanwhile, the spike pulse is inhibited, and the loss is reduced;
through set up thermistor R21 and parallelly connected relay K1 at thermistor both ends in buffer circuit, through thermistor R21 according to impulse current size dynamic adjustment circuit in the resistance size, make diode D2 in the BOOST circuit can not receive impulse current's influence, play the effect of buffering, and after the vehicle navigation start is normal, through electrifying for relay K1, make the normally open contact of parallelly connected at thermistor R21 both ends closed, the electric current exports the power negative pole through the normally open contact that closes, thermistor R21 short circuit, reduce the loss that thermistor R21 brought, raise the efficiency.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a vehicle navigation control power supply, its includes switch boost circuit and control circuit, its characterized in that: the switching boost circuit includes: the circuit comprises an energy storage circuit, a BOOST circuit, an RCD absorption circuit and a buffer circuit;
the power supply is electrically connected with the input end of the BOOST circuit through the energy storage circuit, the sampling end of the energy storage circuit is electrically connected with the current feedback of the control circuit, the control end of the BOOST circuit is electrically connected with the analog output end of the control circuit respectively, the output end of the BOOST circuit supplies power to a load through the buffer circuit, and the RCD absorption circuit is connected between the input end of the BOOST circuit and the output end of the BOOST circuit in parallel.
2. The vehicle-mounted navigation control power supply of claim 1, wherein: the control circuit comprises a current detection circuit, a processor and a totem-pole circuit;
the input end of the current detection circuit is electrically connected with the sampling end of the energy storage circuit, the output end of the current detection circuit is electrically connected with the current feedback of the processor, the analog output end of the processor is electrically connected with the input end of the totem-pole circuit, and the output end of the totem-pole circuit is electrically connected with the control end of the BOOST circuit.
3. The vehicle-mounted navigation control power supply according to claim 2, wherein: the energy storage circuit comprises an inductor L3 and a transformer T1;
the positive electrode of the power supply is electrically connected with one end of the primary side of the transformer T1 through the inductor L3, the other end of the primary side of the transformer T1 is electrically connected with the input end of the BOOST circuit, one end of the secondary side of the transformer T1 is grounded, and the other end of the secondary side of the transformer T1 is electrically connected with the input end of the current detection circuit.
4. A vehicle navigation control power supply according to claim 3, wherein: the BOOST circuit comprises a diode D2, a capacitor C5 and a MOS transistor Q2;
the other end of the primary side of the transformer T1 is electrically connected with the anode of the diode D2 and the drain of the MOS tube Q2 respectively, the cathode of the diode D2 is electrically connected with one end of the capacitor C5 and the input end of the buffer circuit respectively, the other end of the capacitor C5 and the source of the MOS tube Q2 are grounded, and the gate of the MOS tube Q2 is electrically connected with the output end of the totem-pole circuit.
5. The vehicle-mounted navigation control power supply of claim 4, wherein: the RCD absorption circuit includes: a resistor R19, a capacitor C14 and a diode D1;
the anode of the diode D1 is electrically connected with the anode of the diode D2, the cathode of the diode D1 is electrically connected with the cathode of the diode D2, and the capacitor C14 and the resistor R19 are connected in series and then connected in parallel between the anode and the cathode of the diode D1.
6. The vehicle-mounted navigation control power supply according to claim 2, wherein: the buffer circuit comprises a resistor R20, a thermistor R21, an electrolytic capacitor C15, an electrolytic capacitor C16, a capacitor C3, a diode D4, a diode D5 and a relay K1;
the output end of the BOOST circuit is electrically connected with one end of a resistor R20 and the anode of an electrolytic capacitor C15, the other end of a thermistor R20 is electrically connected with the anode of the electrolytic capacitor C16, the cathode of the electrolytic capacitor C15 and the cathode of an electrolytic capacitor C16 are electrically connected with one end of a thermistor R21 and one end of a capacitor C3, the other end of the capacitor C3 outputs power supply voltage, the other end of the thermistor R21 is electrically connected with the cathode of a power supply, a diode D4 is reversely connected in parallel at two ends of a thermistor R21, two normally open contacts of a relay K1 are connected in parallel at two ends of a thermistor R21, one end of a coil of a relay K1 is electrically connected with the cathode of the power supply, and the other end of the coil of the relay K1 is electrically connected with the analog output end.
7. The vehicle-mounted navigation control power supply according to claim 2, wherein: the control circuit further includes: an output voltage acquisition circuit;
the input end of the output voltage acquisition circuit is electrically connected with the output end of the buffer circuit, and the output end of the output voltage acquisition circuit is electrically connected with the voltage detection end of the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022158735.0U CN213426025U (en) | 2020-09-27 | 2020-09-27 | Vehicle-mounted navigation control power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022158735.0U CN213426025U (en) | 2020-09-27 | 2020-09-27 | Vehicle-mounted navigation control power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213426025U true CN213426025U (en) | 2021-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022158735.0U Expired - Fee Related CN213426025U (en) | 2020-09-27 | 2020-09-27 | Vehicle-mounted navigation control power supply |
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| Country | Link |
|---|---|
| CN (1) | CN213426025U (en) |
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2020
- 2020-09-27 CN CN202022158735.0U patent/CN213426025U/en not_active Expired - Fee Related
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Granted publication date: 20210611 |