CN208078904U - A kind of low-voltage power supply circuit - Google Patents
A kind of low-voltage power supply circuit Download PDFInfo
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- CN208078904U CN208078904U CN201820385961.2U CN201820385961U CN208078904U CN 208078904 U CN208078904 U CN 208078904U CN 201820385961 U CN201820385961 U CN 201820385961U CN 208078904 U CN208078904 U CN 208078904U
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Abstract
The utility model discloses a kind of low-voltage power supply circuits.The low-voltage power supply circuit includes：Switching regulation circuit includes adjusting chip, and overcurrent protection and feedback control are carried out for the output voltage to 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 exporting high voltage power supply is converted to low pressure；Output control circuit is powered for controlling low-voltage power supply circuit 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 utility model can ensure that controller is more safe and reliable.
Description
Technical field
The utility model is related 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.
Utility model content
A purpose based on the utility model, the utility model provides low-voltage power supply circuit, in the low pressure of controller
When power supply is broken down, the low-tension supply needed for controller is provided by controller internal circuit in time.
In order to achieve the above objectives, the technical solution of the utility model is realized in：
The utility model provides a kind of low-voltage power supply circuit, is applied to electric machine controller, and the low-voltage power supply circuit is
Flyback topologies switching circuit, including：Electricity is isolated with low pressure for switching regulation circuit, voltage conversion circuit, output control circuit, high pressure
Road 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, and overcurrent protection and feedback are carried out for the output voltage to 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, is used for the high pressure
The high pressure of power supply output is converted to low pressure；
Output control circuit is powered for controlling low-voltage power supply circuit for electric machine controller；
Output voltage feedback circuit is connect with the voltage conversion circuit and the switching regulation circuit respectively, and being used 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 utility model has the beneficial effects that：Low-voltage power supply circuit is arranged as standby in the utility model in electric machine controller
With power supply, when the low-voltage power supply of controller breaks down, using the low-voltage power supply circuit inside controller to high voltage power supply
Output carries out voltage conversion, and device offer power supply is defeated in order to control, and electric machine controller is avoided to be in runaway condition, this reality because of power supply trouble
It uses novel low-voltage power supply circuit using the high voltage power supply of electric machine controller as input, need not be additionally low-voltage power supply circuit
Input power is designed, and high input voltage and low pressure output are isolated for the purpose of security control, ensures controller more
Add safe and reliable.
Description of the drawings
Fig. 1 is the circuit structure block diagram for the low-voltage power supply circuit that the utility model embodiment provides；
Fig. 2 is the circuit diagram for the low-voltage power supply circuit that the utility model embodiment provides.
Specific implementation mode
It is new to this practicality below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
The utility model embodiment provides a kind of electric machine controller inside stand-by power supply design scheme, which uses
Turn the circuit design of voltage by high pressure, which is flyback topologies switch mode power, and cooperation switching regulation circuit output is steady
Fixed low tension.The utility model embodiment is that when low-voltage power supply exception, such as only have in stand-by power supply for control security consideration
It breaks down in vehicle low-voltage power supply, when being unable to ensure controller normal power supply, by stand-by power supply, device provides power supply in order to control
Output, it is ensured that controller runaway condition will not occur because of power supply trouble, keep controller more safe and reliable.
Fig. 1 is the circuit structure block diagram for the low-voltage power supply circuit that the utility model embodiment provides, the low pressure of the present embodiment
Power supply circuit is applied to electric machine controller, and low-voltage power supply circuit, the pressure power supply circuit of the present embodiment are arranged in electric machine controller
For flyback topologies switching circuit.
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, high pressure and low pressure isolation circuit processed 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, and overcurrent guarantor is carried out for the output voltage to 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, is used for 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, which receives, comes from motor
The high-voltage electricity of the high voltage power supply of controller exports low pressure after overvoltage conversion process by output winding；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
When circuit, absorption circuit can be increased in the input winding of transformer T1, reduce noise jamming.
Output control circuit is powered for controlling low-voltage power supply circuit for electric machine controller；The output of the present embodiment controls
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 with voltage conversion circuit and switching regulation circuit respectively, 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；High input voltage and low pressure output are used transformer isolation, height by the present embodiment
Die block works independently, and not will produce mutual crosstalk, avoids the danger of the low voltage control caused by high voltage supply.
Low-voltage power supply circuit is arranged as stand-by power supply, in the low-voltage power supply of controller in the present embodiment in electric machine controller
When 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, avoids electric machine controller because power supply trouble is in runaway condition, the low-voltage power supply circuit of the present embodiment utilizes electricity
The high voltage power supply of machine controller additionally need not design input power, and for safety as input for low-voltage power supply circuit
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 for low-voltage power supply circuit using high voltage power supply
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 configuring according to itself use condition, have very strong applicability.
Auxiliary power circuit is connect with switching regulation circuit and voltage conversion circuit respectively, 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 for the low-voltage power supply circuit that the utility model embodiment provides, as shown in Fig. 2, this implementation
Example in switching regulation circuit include：Adjust chip U1, photo-coupler U2, first resistor R1, second resistance R2, the 6th resistance
R6, the 17th resistance R17, the first capacitance C1, the second capacitance C2, the 8th capacitance C8；Wherein, it shows to adjust chip U1 tools in Fig. 2
There are eight ports, 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
Digital ground terminal；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 configure the switching frequency of low-voltage power supply circuit, first resistor
The connection of the one end R1 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 used to provide external compensation for adjusting chip U1 and control back
Road carries out Impedance feedback adjusting processing to adjusting chip U1 using external compensation control loop, keeps the output of adjusting chip U1 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
The other end connect 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 form feedback branch, photo-coupler
U2 the first output end (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
The first reference ground is connect, the other end of the 6th resistance R6 connects auxiliary power circuit, 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 is separately connected the height of high voltage power supply
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 is separately connected the first reference ground and third capacitance C3 to mouth
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
The high input voltage HV+ of Vgs, high voltage power supply are charged by the 4th resistance R4 for third capacitance C3, and third capacitance C3 is to adjust 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
When Vgs=0, metal-oxide-semiconductor Q1 tends to complete switch off by opening.It is to adjust chip by auxiliary power circuit after metal-oxide-semiconductor Q1 is fully disconnected
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 is metal-oxide-semiconductor, the 4th diode D4
It is common crystal diode, there is one-way conduction effect, the second triode Q2 to constitute the high input voltage branch of low-voltage power supply circuit
Road.
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, and the other end connection transformer T1 of the 4th diode D4 inputs winding.
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, and the other end connects third diode D3's
One end of one end and 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 connecting pin that the 4th capacitance C4 inputs winding with transformer T1 connect the first reference ground；Accessory power supply passes through in the present embodiment
6th resistance R6, the 17th resistance R17, the first output end and second output terminal of photo-coupler U2 form feedback branch, to adjust
It saves chip U1 and output feedback voltage FB is provided, so that low-voltage power supply circuit is adjusted in real time, make 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 are that low pressure exports winding, 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, eleventh resistor R11, twelfth resistor R12, thirteenth resistor 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 connecting pin that the 6th capacitance C6 exports winding with transformer T1 is connect
Second reference ground；
6th diode D6, the 7th diode D7, the tenth resistance R10, eleventh resistor R11 and the 4th triode Q4 compositions
One end of the output branch of low-voltage power supply circuit, the 6th diode D6 is connected to the connection of the 5th diode D5 and the 6th capacitance C6
End, the other end of the 6th diode D6 be separately connected 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 eleventh resistor 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) be output branch output end；
Twelfth resistor R12, thirteenth resistor R13 and the enabled control loop of third transistor Q3 composition outputs, the three or three
One end of the collector terminal connection eleventh resistor R11 of pole pipe Q3, base terminal connect one end and the 12nd of thirteenth resistor R13
The other end of one end of resistance R12, thirteenth resistor R13 is output enable signal EN_PS receiving terminals, twelfth resistor 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 conductings,
Branch conducting is exported, starts to power for electric machine controller.
Wherein, the 6th diode D6 and the 4th triode Q4 is the control unidirectionally powered to make low-voltage power supply circuit have
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) be separately connected the second of photo-coupler
The other end of one end of input terminal, the 9th resistance R9 and the 14th resistance R14, the 9th resistance R9 is separately connected the 7th resistance R7's
The other end of the first input end of one end and photo-coupler U2, the 7th resistance R7 connects output control circuit, i.e. the 7th resistance R7
The other end connect the connecting pin of the 5th diode D5 and the 6th diode D6, the other end of the 14th resistance R14 connects the 7th
One end of capacitance C7, the other end of the 7th capacitance C7 be separately connected 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 is separately connected the 18th resistance R18 and the tenth
The other end of one end of five resistance R15, the 15th resistance R15 connects output control circuit, the i.e. other end 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 meets output and require.
With reference to figure 2, the high pressure in the present embodiment and low pressure isolation circuit, 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 utility model embodiment, in the embodiment of utility model, use
The printed words such as " first ", " second " are to function and act on essentially identical identical entry or similar item distinguishes, art technology
Personnel are appreciated that the printed words such as " first ", " second " are not defined quantity and execution order.
Above description is only a specific implementation of the present invention, under the above-mentioned introduction of the utility model, this field
Technical staff can carry out other improvement or deformation on the basis of the above embodiments.It will be understood by those skilled in the art that
Above-mentioned specific descriptions only preferably explain the purpose of this utility model, and the scope of protection of the utility model should be with claim
Protection domain subject to.
Claims (10)
1. a kind of low-voltage power supply circuit, which is characterized in that be applied to electric machine controller, the low-voltage power supply circuit is flyback topologies
Switching circuit, including：Switching regulation circuit, voltage conversion circuit, output control circuit, high pressure and low pressure isolation circuit and output
Voltage feedback circuit；
Switching regulation circuit connects with the high voltage power supply of electric machine controller, voltage conversion circuit and output voltage feedback circuit respectively
It connects, switching regulation circuit includes adjusting chip, carries out overcurrent protection for the output voltage to low-voltage power supply circuit and feedback is controlled
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, is used for the high voltage power supply
The high pressure of output is converted to low pressure；
Output control circuit is powered for controlling low-voltage power supply circuit for electric machine controller；
Output voltage feedback circuit is connect with the voltage conversion circuit and the switching regulation circuit respectively, for supplying low pressure
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 with the switching regulation circuit and voltage conversion circuit respectively, 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 configure 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 of two capacitances connects, and the other end of the second capacitance connects reference ground, and 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 form feedback branch, and the first output end of photo-coupler connects
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
The other end of reference ground, the 6th resistance connects auxiliary power circuit, 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
The high pressure and low pressure isolation circuit are additionally operable to utilize photo-coupler by the switching regulation circuit, voltage conversion circuit
It is isolated with the output control circuit, 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, drain electrode end is driven to connect the transformer and input winding, source terminal connects the current sampling signal end for adjusting chip；
5th resistance is the current sampling resistor of voltage conversion circuit, and one end of the 5th resistance connects the adjusting chip
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 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 and inputs 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, eleventh resistor, twelfth resistor, thirteenth resistor, 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
It is connected in series in the transformer output winding, the connecting pin that the 6th capacitance exports winding with the transformer connect second
Reference ground；
6th diode, the 7th diode, the tenth resistance, eleventh resistor 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 be separately connected one end of the 7th diode, the tenth resistance one end and the 4th triode source terminal, the 7th diode
One end of the other end, the other end of the tenth resistance and eleventh resistor is all connected with the gate terminal of the 4th triode, the 4th triode
Drain electrode end be it is described output branch output end；
Twelfth resistor, thirteenth resistor and third transistor composition output enable control loop, the collector of third transistor
One end of end connection eleventh resistor, base terminal connect one end of one end and twelfth resistor of thirteenth resistor, the 13rd electricity
The other end of resistance is enable signal receiving terminal, and the other end of twelfth resistor 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 are separately connected the second input terminal of photo-coupler, the 9th resistance and the 14th resistance
One end, the other end of the 9th resistance are separately connected the first input end of one end and photo-coupler of the 7th resistance, 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
It is separately connected the second end of one end and three end adjusters of the 16th resistance, the other end of the 16th resistance is separately connected the 18th
The other end of one end of resistance and the 15th resistance, the 15th resistance connects output control circuit, the other end of the 18th resistance
It is all connected with the second reference ground 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 is separately connected the high voltage power supply, 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 are separately connected the first reference ground and third capacitance
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.
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| CN201820385961.2U CN208078904U (en) | 2018-03-21 | 2018-03-21 | A kind of low-voltage power supply circuit |
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| CN201820385961.2U CN208078904U (en) | 2018-03-21 | 2018-03-21 | A kind of low-voltage power supply circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233721A (en) * | 2018-03-21 | 2018-06-29 | 精进电动科技股份有限公司 | A kind of low-voltage power supply circuit |
| WO2019179113A1 (en) * | 2018-03-21 | 2019-09-26 | 精进电动科技股份有限公司 | Power supply apparatus and standby power source for controller for vehicle |
| WO2021057437A1 (en) * | 2019-09-27 | 2021-04-01 | 精进电动科技股份有限公司 | Standby power supply system for realizing multiple types of protection for parking controller |
| CN114537153A (en) * | 2020-11-25 | 2022-05-27 | 上海汽车变速器有限公司 | Isolation system for high-low voltage signals of motor controller |
| CN115395496A (en) * | 2022-09-06 | 2022-11-25 | 杭州七锐科技有限公司 | Starting safety protection circuit of hard switch electric tool |
-
2018
- 2018-03-21 CN CN201820385961.2U patent/CN208078904U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233721A (en) * | 2018-03-21 | 2018-06-29 | 精进电动科技股份有限公司 | A kind of low-voltage power supply circuit |
| WO2019179113A1 (en) * | 2018-03-21 | 2019-09-26 | 精进电动科技股份有限公司 | Power supply apparatus and standby power source for controller for vehicle |
| US11289939B2 (en) | 2018-03-21 | 2022-03-29 | Jing-Jin Electric Technologies Co., Ltd. | Power supply apparatus and standby power source for controller for vehicle |
| WO2021057437A1 (en) * | 2019-09-27 | 2021-04-01 | 精进电动科技股份有限公司 | Standby power supply system for realizing multiple types of protection for parking controller |
| CN114537153A (en) * | 2020-11-25 | 2022-05-27 | 上海汽车变速器有限公司 | Isolation system for high-low voltage signals of motor controller |
| CN114537153B (en) * | 2020-11-25 | 2023-09-26 | 上海汽车变速器有限公司 | Isolation system for high-low voltage signals of motor controller |
| CN115395496A (en) * | 2022-09-06 | 2022-11-25 | 杭州七锐科技有限公司 | Starting safety protection circuit of hard switch electric tool |
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