CN108233721A - A kind of low-voltage power supply circuit - Google Patents
A kind of low-voltage power supply circuit Download PDFInfo
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- CN108233721A CN108233721A CN201810236326.2A CN201810236326A CN108233721A CN 108233721 A CN108233721 A CN 108233721A CN 201810236326 A CN201810236326 A CN 201810236326A CN 108233721 A CN108233721 A CN 108233721A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 28
- 230000005611 electricity Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009414 blockwork Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of low-voltage power supply circuits.The low-voltage power supply circuit includes：Switching regulation circuit, voltage conversion circuit, output control circuit, high pressure and low pressure isolation circuit and output voltage feedback circuit；Switching regulation circuit includes adjusting chip, for carrying out overcurrent protection and feedback control to the output voltage of low-voltage power supply circuit, adjusts the switching frequency of low-voltage power supply circuit, and carry out circuit compensation to low-voltage power supply circuit；Voltage conversion circuit includes transformer, and the high pressure for the high voltage power supply to be exported is converted to low pressure；Output control circuit is used to that low-voltage power supply circuit to be controlled to power for electric machine controller；Output voltage feedback circuit is used to the output voltage signal of low-voltage power supply circuit feeding back to the switching regulation circuit；High pressure with low pressure isolation circuit is used to that switching regulation circuit, voltage conversion circuit to be isolated with output control circuit, output voltage feedback circuit by transformer.The present invention can ensure that controller is more safe and reliable.
Description
Technical field
The present invention relates to electric machine controller technical field, more particularly to a kind of low-voltage power supply circuit.
Background technology
In fields such as automobile powers, core component of the controller as vehicle power, control safety is particularly important, mostly
The low voltage control of controller is powered by vehicle A-battery as supply input.
It is existing to accomplish very safe and reliable since the system of vehicle is relative complex, and motor and controller
Highly important position is occupied on vehicle, driving safety made higher requirement currently on the market, to make product
It is essential to increase corresponding measure inside controller for more reliable performance safety.
Invention content
Based on one object of the present invention, the present invention provides low-voltage power supply circuits, occur in the low-voltage power supply of controller
During failure, the low-tension supply needed for controller is provided by controller internal circuit in time.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
The present invention provides a kind of low-voltage power supply circuits, and applied to electric machine controller, the low-voltage power supply circuit includes：It opens
It closes and adjusts circuit, voltage conversion circuit, output control circuit, high pressure and low pressure isolation circuit and output voltage feedback circuit；
Switching regulation circuit respectively with the high voltage power supply of electric machine controller, voltage conversion circuit and output voltage feedback circuit
Connection, switching regulation circuit include adjusting chip, for carrying out overcurrent protection and feedback to the output voltage of low-voltage power supply circuit
Control adjusts the switching frequency of low-voltage power supply circuit, and carries out circuit compensation to low-voltage power supply circuit；
Voltage conversion circuit is connect with output control circuit, and voltage conversion circuit includes transformer, for by the high pressure
The high pressure of power supply output is converted to low pressure；
Output control circuit, for low-voltage power supply circuit to be controlled to power for electric machine controller；
Output voltage feedback circuit is connect respectively with the voltage conversion circuit and the switching regulation circuit, for will be low
The output voltage signal of pressure power supply circuit feeds back to the switching regulation circuit；
High pressure and low pressure isolation circuit, for passing through the transformer by the switching regulation circuit, voltage conversion circuit
It is isolated with the output control circuit, output voltage feedback circuit.
The beneficial effects of the invention are as follows：The present invention sets low-voltage power supply circuit as stand-by power supply in electric machine controller,
When the low-voltage power supply of controller breaks down, the output of high voltage power supply is carried out using the low-voltage power supply circuit inside controller
Voltage is converted, and device offer power supply is defeated in order to control, and electric machine controller is avoided to be in runaway condition, low pressure of the invention because of power supply trouble
Power supply circuit does not need to additionally design input electricity for low-voltage power supply circuit by the use of the high voltage power supply of electric machine controller as input
Source, and high input voltage and low pressure output are isolated for the purpose of security control, ensure that controller is more safe and reliable.
Description of the drawings
Fig. 1 is the circuit structure block diagram of low-voltage power supply circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of low-voltage power supply circuit provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The embodiment of the present invention provides stand-by power supply designing scheme inside a kind of electric machine controller, which uses by height
Pressure turns the circuit design of voltage, which is flyback topologies switch mode power, cooperation switching regulation circuit output stabilization
Low tension.The embodiment of the present invention be for control security consideration, it is such as low only in vehicle in stand-by power supply during low-voltage power supply exception
Pressure power supply is broken down, and when can not ensure controller normal power supply, by stand-by power supply, device is provided for electricity output in order to control, it is ensured that
Controller runaway condition will not occur because of power supply trouble, make controller more safe and reliable.
Circuit structure block diagrams of the Fig. 1 for low-voltage power supply circuit provided in an embodiment of the present invention, the low-voltage power supply of the present embodiment
Circuit is applied to electric machine controller, and low-voltage power supply circuit is set in electric machine controller.
As shown in Figure 1, the low-voltage power supply circuit of the present embodiment includes：Switching regulation circuit, voltage conversion circuit, output control
Circuit processed, high pressure and low pressure isolation circuit and output voltage feedback circuit.
Wherein, switching regulation circuit is anti-with the high voltage power supply of electric machine controller, voltage conversion circuit and output voltage respectively
Current feed circuit connects, and switching regulation circuit includes adjusting chip U1, for carrying out overcurrent guarantor to the output voltage of low-voltage power supply circuit
Shield and feedback control adjust the switching frequency of low-voltage power supply circuit, and carry out circuit compensation to low-voltage power supply circuit；The present embodiment
In the design of switching regulation circuit need to be matched according to use the characteristic for adjusting chip U1, to ensure that adjusting chip U1 can
To carry out overcurrent protection and closed loop feedback control to output voltage and switching frequency and circuit compensation can be adjusted, it is ensured that defeated
Go out the stabilization of voltage.
Voltage conversion circuit is connect with output control circuit, and voltage conversion circuit includes transformer T1, for by high-voltage electricity
The high pressure of source output is converted to low pressure, i.e. transformer T1 includes input winding and output winding, and input winding is received from motor
After overvoltage conversion process, low pressure is exported by output winding for the high-voltage electricity of the high voltage power supply of controller；Electricity in the present embodiment
Voltage conversion circuit includes high input voltage branch, and high input voltage branch connecting valve adjusts circuit and transformer T1；The present embodiment
Each device needs to select suitable work compression resistance according to input voltage value in voltage conversion circuit, when input branch is by golden oxygen half
The switch of field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide-semiconductor) composition
During circuit, absorption circuit can be increased in the input winding of transformer T1, reduce noise jamming.
Output control circuit, for low-voltage power supply circuit to be controlled to power for electric machine controller；The output control of the present embodiment
Circuit can control the conducting of the output branch of low-voltage power supply circuit, and when controller low-voltage power supply is normal, low pressure supplies
The output branch of circuit does not work, and will not increase the load of low-voltage power supply circuit, and low-voltage power supply circuit is in relatively low work(at this time
Consumption state, when providing output enable signal EN_PS, the output branch of low-voltage power supply circuit can just be connected, and start to give motor control
Device power supply processed.
Output voltage feedback circuit is connect respectively with voltage conversion circuit and switching regulation circuit, for low-voltage power supply is electric
The output voltage signal on road feeds back to switching regulation circuit, improves the electrical stability of low-voltage power supply circuit.
High pressure and low pressure isolation circuit, for passing through transformer T1 by switching regulation circuit, voltage conversion circuit and output
Control circuit, the isolation of output voltage feedback circuit；The present embodiment is by high input voltage and low pressure output using transformer isolation, height
Die block works independently, and will not generate mutual crosstalk, avoid the danger of the low voltage control caused by high voltage supply.
The present embodiment sets low-voltage power supply circuit as stand-by power supply in electric machine controller, in the low-voltage power supply of controller
During failure, voltage conversion is carried out to the output of high voltage power supply using the low-voltage power supply circuit inside controller, in order to control device
It is defeated to provide power supply, avoiding electric machine controller, the low-voltage power supply circuit of the present embodiment utilizes electricity because power supply trouble is in runaway condition
The high voltage power supply of machine controller does not need to additionally design input power, and for safety for low-voltage power supply circuit as input
High input voltage and low pressure output is isolated in the purpose of control, ensures that controller is more safe and reliable.
The low-voltage power supply circuit of the present embodiment further includes auxiliary power circuit and high-voltage starting circuit.
Wherein, high-voltage starting circuit is connect with switching regulation circuit, for being carried using high voltage power supply for low-voltage power supply circuit
For starting voltage and starting current；The present embodiment provides startup voltage and current using high voltage power supply for low-voltage power supply circuit, no
Need to be individually for adjust chip and input power be provided, each high tension apparatus of the present embodiment using when should be noted the work electricity of each device
Pressure, each signal level can be adjusted when being configured according to itself use condition, have very strong applicability.
Auxiliary power circuit is connect respectively with switching regulation circuit and voltage conversion circuit, in switching regulation circuit work
After work supply input is provided for switching regulation circuit；The present embodiment increases power supply all the way in high input voltage side and exports, output electricity
Road provides stable supply input mainly after switching regulation circuit start-up operation, to adjust chip U1, it is ensured that adjusts chip
The powered stable of U1.
For the connection relation in the present embodiment mesolow power supply circuit between each device is described in detail, the present embodiment combines figure
2 illustrate.
Fig. 2 is the circuit diagram of low-voltage power supply circuit provided in an embodiment of the present invention, as shown in Fig. 2, in the present embodiment
Switching regulation circuit include：Adjust chip U1, photo-coupler U2, first resistor R1, second resistance R2, the 6th resistance R6, the
17 resistance R17, the first capacitance C1, the second capacitance C2, the 8th capacitance C8；Wherein, show that adjusting chip U1 has eight in Fig. 2
Port, with reference to figure 2, port 1 is current sampling signal end；Port 2 is compensating end；Port 3 is feedback end；Port 4 is digitally
End；Port 5 is power supply ground terminal；Port 6 is driving end；Port 7 is frequency configuration end；Port 8 is voltage input end.
Wherein, the first resistor R1 of switching regulation circuit is used to be configured the switching frequency of low-voltage power supply circuit, first resistor
The connection of R1 one end adjusts the frequency configuration end of chip U1, and the other end connects the first reference ground；
Second resistance R2, the first capacitance C1 and the second capacitance C2 are controlled back for providing external compensation for adjusting chip U1
Road carries out Impedance feedback adjusting processing using external compensation control loop to adjusting chip U1, and the output for making adjusting chip U1 is steady
It is fixed, improve the precise control for adjusting chip U1；One end of second resistance R2 is connect with one end of the first capacitance C1, the first capacitance
The other end of C1 connects the first reference ground, and the other end of second resistance R2 is connect with one end of the second capacitance C2, the second capacitance C2
Other end connection reference ground, second resistance R2 connect the compensating end of adjusting chip U1 with the connecting pin of the second capacitance C2；
Photo-coupler U2, the 6th resistance R6, the 17th resistance R17 and the 8th capacitance C8 composition feedback branches, photo-coupler
U2 the first output terminal (correspond to Fig. 2 shows U2 port 3) connection the 17th resistance R17 one end, the 17th resistance R17
The other end connect the first reference ground, photo-coupler U2 second output terminal (correspond to Fig. 2 shows U2 port 4) connect respectively
One end of the 8th capacitance C8, one end of the 6th resistance R6 and the feedback end for adjusting chip U1 are connect, the other end of the 8th capacitance C8 connects
Connect the first reference ground, the other end connection auxiliary power circuit of the 6th resistance R6, as shown in Fig. 2, the other end of the 6th resistance R6
Be connected between the second diode and third diode, the first input end of photo-coupler U2 (correspond to Fig. 2 shows U2 end
Mouth 1) and the second input terminal (correspond to Fig. 2 shows U2 port 2) connection output voltage feedback circuit.
With reference to figure 2, the high-voltage starting circuit of low-voltage power supply circuit includes：3rd resistor R3, the 4th resistance R4, third capacitance
C3, the first triode Q1, the first diode D1；Wherein, the first triode Q1 is metal-oxide-semiconductor, and the first diode D1 is two pole of voltage stabilizing
Pipe.
Wherein, one end of the 3rd resistor R3 in high-voltage starting circuit and the 4th resistance R4 connects the height of high voltage power supply respectively
Press input terminal HV+, the other end of 3rd resistor R3 connect the first triode Q1 gate terminal (correspond to Fig. 2 shows Q1 end
And one end of the first diode D1 1), the other end of the first diode D1 connects the first reference ground and third capacitance C3 to mouth respectively
One end, the other end connection of third capacitance C3 adjust the voltage input end of chip U1, the other end connection first of the 4th resistance R4
Triode Q1 drain electrode end (correspond to Fig. 2 shows Q1 port 2), the source terminal of the first triode Q1 (correspond to Fig. 2 shows
Q1 port 3) connection adjusts the voltage input end of chip U1.
When high-voltage starting circuit powers on, zener diode D1 is to metal-oxide-semiconductor Q1 to provide conducting voltage, i.e. gate-source voltage
Vgs, the high input voltage HV+ of high voltage power supply are charged by the 4th resistance R4 for third capacitance C3, and third capacitance C3 is adjusts chip
U1 provides transient state starting current and voltage needed for starting, when the input voltage (VIN voltage) for adjusting chip U1 gradually rises up to
During Vgs=0, metal-oxide-semiconductor Q1 tends to complete switch off by opening.After metal-oxide-semiconductor Q1 is fully disconnected, by auxiliary power circuit to adjust chip
U1 provides supply input.
With reference to figure 2, the voltage conversion circuit of low-voltage power supply circuit includes：Transformer T1, the second triode Q2, the 8th resistance
R8, the 5th capacitance C5, the 4th diode D4 and the 5th resistance R5；Wherein, the second triode Q2 be metal-oxide-semiconductor, the 4th diode D4
For common crystal diode, there is one-way conduction effect, the second triode Q2 forms the high input voltage branch of low-voltage power supply circuit.
Second triode Q2 (corresponds to Fig. 2 for the switch as voltage conversion circuit, the gate terminal of the second triode Q2
The port 1 of the Q2 shown) connection adjusts the driving end of chip U1, drain electrode end (correspond to Fig. 2 shows Q2 port 2) connection becomes
Depressor T1 inputs winding, source terminal (correspond to Fig. 2 shows Q2 port 3) connection adjusts the current sampling signal of chip U1
End；
The absorption circuit of 8th resistance R8, the 5th capacitance C5 and the 4th diode D4 composition transformer T1 input windings, the
One end of eight resistance R8 and the 5th capacitance C5 is all connected to the high input voltage HV+ of high voltage power supply, the 8th resistance R8 and the 5th capacitance
The other end of C5 is all connected with one end of the 4th diode D4, the other end connection transformer T1 input windings of the 4th diode D4.
5th resistance R5 is the current sampling resistor of voltage conversion circuit, and one end connection of the 5th resistance R5 adjusts chip U1
Current sampling signal end, the other end connect the first reference ground.
With reference to figure 2, the auxiliary power circuit of low-voltage power supply circuit includes：Second diode D2, third diode D3 and
Four capacitance C4；Wherein, the second diode D2, third diode D3 are common crystal diode, have one-way conduction effect.
One end connection of second diode D2 adjusts the voltage input end of chip U1, other end connection third diode D3's
One end and one end of the 4th capacitance C4, the 4th capacitance C4 and the other end of third diode D3 connect the input of transformer T1 around
Group, the 4th capacitance C4 connect the first reference ground with the connecting pin of transformer T1 input windings；Accessory power supply passes through in the present embodiment
6th resistance R6, the 17th resistance R17, the first output terminal and second output terminal the composition feedback branch of photo-coupler U2, to adjust
It saves chip U1 and output feedback voltage FB is provided, low-voltage power supply circuit is enable to adjust in real time, makes output voltage more accurate stable.
It should be noted that Fig. 2 shows the transformer T1 with 12 ends, as shown in Fig. 2, 1~6 end of transformer T1 is height
Pressure input winding, 7~12 ends export winding for low pressure, and the terminal 1 of high input voltage winding connects the high input voltage HV of high voltage power supply
+, the terminal 3 of high input voltage winding connects the 4th diode D4, and the terminal 5 of high input voltage winding connects third diode D3, high
The terminal 6 of pressure input winding connects the first reference ground, and the terminal 7~9 of High voltage output winding connects the second reference ground, High voltage output
The terminal 10~12 of winding connects the 5th diode D5.
With reference to figure 2, the output control circuit of low-voltage power supply circuit includes：5th diode D5, the 6th diode D6, the 7th
Diode D7, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 6th capacitance C6,
Three triode Q3, the 4th triode Q4；Wherein, third transistor Q3 be field-effect tube, the 4th triode Q4 be metal-oxide-semiconductor, the 5th
Diode D5, the 6th diode D6, the 7th diode D7 are common crystal diode, have one-way conduction effect.
The filter circuit of 5th diode D5 and the 6th capacitance C6 composition transformer T1 output windings, the 5th diode D5 and
6th capacitance C6 is connected in series in transformer T1 output windings, and the 6th capacitance C6 is connect with the connecting pin of transformer T1 output windings
Second reference ground；
6th diode D6, the 7th diode D7, the tenth resistance R10, the 11st resistance R11 and the 4th triode Q4 compositions
The output branch of low-voltage power supply circuit, one end of the 6th diode D6 are connected to the connection of the 5th diode D5 and the 6th capacitance C6
End, the other end of the 6th diode D6 connect respectively one end of the 7th diode D7, the tenth resistance R10 one end and the four or three pole
Pipe Q4 source terminal (it is corresponding Fig. 2 shows Q4 port 3), the other end of the 7th diode D7, the other end of the tenth resistance R10
With one end of the 11st resistance R11 be all connected with the 4th triode Q4 gate terminal (it is corresponding Fig. 2 shows Q4 port 1), the 4th
Triode Q4 drain electrode end (it is corresponding Fig. 2 shows Q4 port 4) output terminal for output branch；
12nd resistance R12, the 13rd resistance R13 and the enabled control loop of third transistor Q3 composition outputs, the three or three
The collector terminal of pole pipe Q3 connects one end of the 11st resistance R11, and base terminal connects one end and the 12nd of the 13rd resistance R13
One end of resistance R12, the other end of the 13rd resistance R13 is output enable signal EN_PS receiving terminals, the 12nd resistance R12's
The other end connects the second reference ground, and the emitter of third transistor Q3 connects the second reference ground.Illustratively, when the enabled letter of output
When number EN_PS is high level, third transistor Q3 conductings, at this point, the Vgs of the 4th triode Q4<0, the 4th triode Q4 are connected,
Branch conducting is exported, starts to power for electric machine controller.
Wherein, the 6th diode D6 and the 4th triode Q4 is in order to which low-voltage power supply circuit is made to have the control unidirectionally powered
System, prevents normal power supply electric current from pouring in down a chimney, it is ensured that output power supply has controllability.
With reference to figure 2, the output voltage feedback circuit of low-voltage power supply circuit includes：7th resistance R7, the 9th resistance R9, the tenth
Four resistance R14, the 15th resistance R15, the 16th resistance R16, the 18th resistance R18, the 7th capacitance C7, three end adjuster U3 are
The integrated chip of linear regulation, as shown in Fig. 2, voltage on the basis of 2 corresponding voltage of port, when reference voltage changes, port 1
Electric current occur linear change；
7th resistance R7, the 9th resistance R9, the 14th resistance R14, the 16th resistance R16 and the 7th capacitance C7 form three ends
The adjusting circuit of adjuster U3, the 15th resistance R15 and the 18th resistance R18 divide the output voltage of low-voltage power supply circuit
Pressure, and provide reference data voltage for three end adjuster U3；I.e. the 15th resistance R15, the 18th resistance R18 to output voltage into
Row partial pressure provides reference data voltage to three end adjuster U3, then feeds back to adjusting core by photo-coupler U2 isolation outputs
The feedback end of piece U1.
Wherein, three end adjuster U3 first ends (it is corresponding Fig. 2 shows U3 port 1) connect the second of photo-coupler respectively
One end of input terminal, the 9th resistance R9 and the 14th resistance R14, the other end of the 9th resistance R9 connect the 7th resistance R7's respectively
One end and the first input end of photo-coupler U2, the other end connection output control circuit of the 7th resistance R7, i.e. the 7th resistance R7
Other end connection the 5th diode D5 and the 6th diode D6 connecting pin, the other end of the 14th resistance R14 connects the 7th
One end of capacitance C7, the other end of the 7th capacitance C7 connect respectively the 16th resistance R16 one end and three end adjuster U3
Two ends (it is corresponding Fig. 2 shows U3 port 2), the other end of the 16th resistance R16 connects the 18th resistance R18 and the tenth respectively
One end of five resistance R15, the other end of the other end connection output control circuit, i.e. the 15th resistance R15 of the 15th resistance R15
Connect the connecting pin of the 5th diode D5 and the 6th diode D6, the other end of the 18th resistance R18 and three end adjuster U3's
Third end (it is corresponding Fig. 2 shows U3 port 3) be all connected with the second reference ground.
The output voltage feedback circuit of the present embodiment introduces feedback signal in output branch, by isolation optocoupler clutch U2,
Three end adjuster U3 and peripheral circuit composition output backfeed loop, can timely and accurately feed back outputs level signals and
Accomplish that high pressure is isolated with low pressure, preferably meet output requirement.
With reference to figure 2, high pressure and low pressure isolation circuit in the present embodiment, be by transformer T1 and photo-coupler U2 carry out every
From, power input and accessory power supply are high-pressure side, and using high input voltage HV- as with reference to ground, power supply output is low-pressure side for high-pressure side,
Using low-tension supply GND as reference ground；That is the first reference ground is high input voltage HV-, and the second reference ground is low-tension supply GND.
For the ease of clearly describing the technical solution of the embodiment of the present invention, in the embodiment of invention, employ " first ",
Printed words such as " second " distinguish function and the essentially identical identical entry of effect or similar item, and those skilled in the art can manage
The printed words such as solution " first ", " second " are not defined quantity and execution order.
The above description is merely a specific embodiment, under the above-mentioned introduction of the present invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is only preferably explained in body description, and protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of low-voltage power supply circuit, which is characterized in that applied to electric machine controller, the low-voltage power supply circuit includes：Switch
Adjust circuit, voltage conversion circuit, output control circuit, high pressure and low pressure isolation circuit and output voltage feedback circuit；
Switching regulation circuit connects respectively with the high voltage power supply of electric machine controller, voltage conversion circuit and output voltage feedback circuit
It connects, switching regulation circuit includes adjusting chip, for carrying out overcurrent protection to the output voltage of low-voltage power supply circuit and feeding back to control
System adjusts the switching frequency of low-voltage power supply circuit, and carries out circuit compensation to low-voltage power supply circuit；
Voltage conversion circuit is connect with output control circuit, and voltage conversion circuit includes transformer, for by the high voltage power supply
The high pressure of output is converted to low pressure；
Output control circuit, for low-voltage power supply circuit to be controlled to power for electric machine controller；
Output voltage feedback circuit is connect respectively with the voltage conversion circuit and the switching regulation circuit, for low pressure to be supplied
The output voltage signal of circuit feeds back to the switching regulation circuit；
High pressure and low pressure isolation circuit, for passing through the transformer by the switching regulation circuit, voltage conversion circuit and institute
State output control circuit, the isolation of output voltage feedback circuit.
2. circuit according to claim 1, which is characterized in that further include：
Auxiliary power circuit is connect respectively with the switching regulation circuit and voltage conversion circuit, in switch-mode regulation electricity
After the work of road supply input is provided for the switching regulation circuit.
3. circuit according to claim 2, which is characterized in that auxiliary power circuit includes：Second diode, the three or two pole
Pipe and the 4th capacitance；
One end connection of second diode adjusts the voltage input end of chip, and the other end connects one end and the 4th of third diode
One end of capacitance, the 4th capacitance connect the input winding of the transformer, the 4th capacitance and institute with the other end of third diode
The connecting pin for stating transformer input winding connects the first reference ground.
4. circuit according to claim 2, which is characterized in that the switching regulation circuit further includes：Photo-coupler, first
Resistance, second resistance, the 6th resistance, the 17th resistance, the first capacitance, the second capacitance, the 8th capacitance；
First resistor is used to be configured the switching frequency of low-voltage power supply circuit, and the connection of first resistor one end adjusts the frequency configuration of chip
End, the other end connect the first reference ground；
Second resistance, the first capacitance and the second capacitance are used to provide external compensation control loop to adjust chip, second resistance
One end is connect with one end of the first capacitance, and the other end of the first capacitance connects the first reference ground, the other end of second resistance and the
One end connection of two capacitances, the other end connection reference ground of the second capacitance, second resistance connect tune with the connecting pin of the second capacitance
Save the compensating end of chip；
Photo-coupler, the 6th resistance, the 17th resistance and the 8th capacitance composition feedback branch, the first output terminal of photo-coupler connect
One end of the 17th resistance is connect, the other end of the 17th resistance connects the first reference ground, the second output terminal difference of photo-coupler
Connect one end of the 8th capacitance, one end of the 6th resistance and the feedback end for adjusting chip, the other end connection first of the 8th capacitance
Reference ground, the other end connection auxiliary power circuit of the 6th resistance, the first input end of photo-coupler and the connection of the second input terminal
The output voltage feedback circuit.
5. circuit according to claim 4, which is characterized in that
High pressure and low pressure isolation circuit are additionally operable to utilize photo-coupler by the switching regulation circuit, voltage conversion circuit and institute
State output control circuit, the isolation of output voltage feedback circuit.
6. circuit according to claim 1, which is characterized in that voltage conversion circuit further includes：Second triode, the 5th electricity
Resistance, the 8th resistance, the 5th capacitance, the 4th diode；
Second triode connects the adjusting chip for the switch as voltage conversion circuit, the gate terminal of the second triode
End is driven, drain electrode end connects the transformer input winding, the source terminal connection current sampling signal end for adjusting chip；
5th resistance is the current sampling resistor of voltage conversion circuit, one end connection adjusting chip of the 5th resistance
Current sampling signal end, the other end connect the first reference ground；
8th resistance, the 5th capacitance and the 4th diode form the absorption circuit of the transformer input winding, the 8th resistance and
One end of 5th capacitance is all connected to the high voltage power supply, and the other end of the 8th resistance and the 5th capacitance is all connected with the 4th diode
One end, the other end of the 4th diode connects the transformer input winding.
7. circuit according to claim 1, which is characterized in that the output control circuit includes：5th diode, the 6th
Diode, the 7th diode, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 6th capacitance, the three or three pole
Pipe, the 4th triode；
5th diode and the 6th capacitance form the filter circuit of the transformer output winding, the 5th diode and the 6th capacitance
The transformer output winding is connected in series in, the 6th capacitance connect second with the connecting pin of transformer output winding
Reference ground；
6th diode, the 7th diode, the tenth resistance, the 11st resistance and the 4th triode form the low-voltage power supply circuit
Output branch, one end of the 6th diode is connected to the connecting pin of the 5th diode and the 6th capacitance, the 6th diode it is another
One end connects one end, one end of the tenth resistance and the source terminal of the 4th triode of the 7th diode respectively, the 7th diode
One end of the other end, the other end of the tenth resistance and the 11st resistance is all connected with the gate terminal of the 4th triode, the 4th triode
Drain electrode end for it is described output branch output terminal；
12nd resistance, the 13rd resistance and the enabled control loop of third transistor composition output, the collector of third transistor
One end of the 11st resistance of end connection, base terminal connect one end of the 13rd resistance and one end of the 12nd resistance, the 13rd electricity
The other end of resistance is enable signal receiving terminal, and the other end of the 12nd resistance connects the second reference ground, the transmitting of third transistor
Pole connects the second reference ground.
8. circuit according to claim 4, which is characterized in that output voltage feedback circuit includes：7th resistance, the 9th electricity
Resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 18th resistance, the 7th capacitance, three end adjusters；
7th resistance, the 9th resistance, the 14th resistance, the 16th resistance and the 7th capacitance form the adjusting electricity of three end adjusters
Road, the 15th resistance and the 18th resistance divide the output voltage of the low-voltage power supply circuit, and are three end adjusters
Reference data voltage is provided；
Wherein, three end adjuster first ends connect the second input terminal of photo-coupler, the 9th resistance and the 14th resistance respectively
One end, the other end of the 9th resistance connect one end of the 7th resistance and the first input end of photo-coupler respectively, the 7th resistance
The other end connects output control circuit, and the other end of the 14th resistance connects one end of the 7th capacitance, the other end of the 7th capacitance
The second end of one end of the 16th resistance of connection and three end adjusters, the other end of the 16th resistance connect the 18th respectively respectively
One end of resistance and the 15th resistance, the other end connection output control circuit of the 15th resistance, the other end of the 18th resistance
The second reference ground is all connected with the third end of three end adjusters.
9. circuit according to claim 1, which is characterized in that further include：
High-voltage starting circuit is connect with the switching regulation circuit, for being the low-voltage power supply circuit using the high voltage power supply
It provides and starts voltage and starting current.
10. circuit according to claim 9, which is characterized in that the high-voltage starting circuit includes：3rd resistor, the 4th
Resistance, third capacitance, the first triode, the first diode；
One end of 3rd resistor and the 4th resistance connects the high voltage power supply respectively, and the other end of 3rd resistor connects the one or three pole
One end of the gate terminal of pipe and the first diode, the other end of the first diode connect the first reference ground and third capacitance respectively
One end, the other end connection of third capacitance adjust the voltage input end of chip, and the other end of the 4th resistance connects the first triode
Drain electrode end, the first triode source terminal connection adjust chip voltage input end.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810236326.2A CN108233721A (en) | 2018-03-21 | 2018-03-21 | A kind of low-voltage power supply circuit |
| PCT/CN2018/113378 WO2019179113A1 (en) | 2018-03-21 | 2018-11-01 | Power supply apparatus and standby power source for controller for vehicle |
| JP2020542149A JP7073508B2 (en) | 2018-03-21 | 2018-11-01 | Backup power supply for power supply and vehicle controller |
| US17/040,024 US11289939B2 (en) | 2018-03-21 | 2018-11-01 | Power supply apparatus and standby power source for controller for vehicle |
| EP18910839.2A EP3751717A4 (en) | 2018-03-21 | 2018-11-01 | Power supply apparatus and standby power source for controller for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810236326.2A CN108233721A (en) | 2018-03-21 | 2018-03-21 | A kind of low-voltage power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108233721A true CN108233721A (en) | 2018-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810236326.2A Pending CN108233721A (en) | 2018-03-21 | 2018-03-21 | A kind of low-voltage power supply circuit |
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| Country | Link |
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| CN (1) | CN108233721A (en) |
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