CN204761289U - Switch converter and switch constant current source - Google Patents
Switch converter and switch constant current source Download PDFInfo
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- CN204761289U CN204761289U CN201520510202.0U CN201520510202U CN204761289U CN 204761289 U CN204761289 U CN 204761289U CN 201520510202 U CN201520510202 U CN 201520510202U CN 204761289 U CN204761289 U CN 204761289U
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Abstract
The utility model provides a switch converter and switch constant current source, the switch converter of control switch constant current source contains at least three terminal: the control flow is through the switch terminal of the magnetic element of switch constant current source electric current, for the power supply terminal of on -off controller inside power supply and the public terminal that is used for on -off controller internal reference earth level, the power supply voltage of an electric capacity with level and smooth on -off controller connects in parallel between power supply terminal and the public terminal, the control to switch constant current source output current is realized through magnetic element's electric current to the on -off controller control flow. Its advantage lies in utilizing this on -off controller can realize low -cost integrated circuit and switch constant current source, and this on -off controller, utilizes the integrated circuit and the switch constant current source of the low cost of this on -off controller realization all can utilize the external signal regulating current.
Description
Technical field
The utility model relates to the implementation method of LED drive circuit and integrated circuit, the switch constant-current source being specifically related to a kind of switch converters and utilizing it to realize.
Background technology
Along with the technical development of LED illumination product is ripe day by day, LED illumination product has replaced traditional lighting products gradually becomes main flow.In current LED illumination drive scheme, switch constant-current source is compared with Linear CCS has plurality of advantages, such as higher efficiency, wider input voltage range, and therefore current LED drive scheme is still based on switch constant-current source.But along with being growing more intense of market competition, the cost reducing switch constant-current source is also imperative.
Fig. 1 is current common a kind of switch constant-current source circuit schematic diagram, comprises power supply, sustained diode, magnetic element M, switch converters and load.Wherein, switch converters comprises 4 terminals: in order to control the switch terminal 1 of magnetic element M turn-on and turn-off electric current, the power supply terminal 2 of powering for switch converters internal circuit, for reference to the public terminal 3 of ground level and the inspection stream terminal 4 for load current detection.
The negative electrode of sustained diode exports with power supply and is connected, the anode of sustained diode is connected with one end of magnetic element M, the other end of magnetic element M is connected to power supply through load and exports, the joint of sustained diode and magnetic element M is connected to the switch terminal 1 of switch converters, electric capacity C is connected in parallel on the voltage in order to slicked switch converter between power supply terminal 2 and ground,, resistance R is connected in parallel between inspection stream terminal 4 and ground and flows through the electric current of switch terminal 1, the 3rd terminal ground of switch converters in order to detect.
Operation principle is: when the power switch conducting of switch converters inside, the electric current of magnetic element M rises, when the power switch of switch converters inside turns off, the electric current of magnetic element M declines via diode D afterflow, the conducting duty ratio of the power switch of control switch converter inside, can make outputting current steadily at steady state value.
Switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit and power switch; Power supply circuits are switch converters in-line power; The voltage distribution of power supply circuits is produced the current settings signal of a current reference signal Iref as switch constant-current source to other circuit units in switch converters by internal bias circuit; Resistance R detects the electric current flowing through power switch and obtains switching current signal Isense, a part for the corresponding load current of this signal; Current reference signal Iref and switching current signal Isense is input in constant-current control circuit jointly; Constant-current control circuit calculates the negative feedback input signal of load average current signal as switch constant-current source control loop according to switching current signal Isense, when this signal is greater than current reference signal Iref, the conducting duty ratio that constant-current control circuit controls power switch reduces, otherwise when this signal is less than current reference signal Iref, the conducting duty ratio of the output pulsed power switch of constant-current control circuit increases, and final stable state is: the output load current of switch constant-current source is directly proportional to current reference signal Iref.
Switch converters corresponding to the program can manufacture special integrated circuit and use.For special integrated circuit, the function of inspection stream terminal 4 can arrange load current easily, but it makes integrated circuit have to increase dedicated pin, which increases the material cost of user.A kind of way omitting inspection stream terminal 4 is that resistance R is also integrated into switch converters inside, and can obtain the integrated circuit profile of 3 pins, cost is the function sacrificing outer setting load current.
Therefore, design a kind of current programmable, the switch converters of low cost seems necessary in order to control switch constant-current source.
Utility model content
The technical solution of the utility model is: provide the simple switch converters of a kind of circuit and the switch constant-current source utilizing it to realize.
The switch converters of a kind of control switch constant-current source that the utility model provides, switch constant-current source comprises at least one magnetic element, and switch converters control flow check, through the electric current of the magnetic element of switch constant-current source, realizes the control to switch constant-current source output current; Switch converters comprises at least three terminals: control flow check, through the switch terminal of the magnetic element electric current of switch constant-current source, is the power supply terminal of switch converters in-line power and the public terminal for switch converters internal reference ground level; Between power supply terminal and public terminal, an electric capacity in parallel is with the supply power voltage of slicked switch converter.
Further, a kind of switch converters that the utility model provides, also has such feature: flow through the electric current of power supply terminal in order to the electric current of control flow check through switch terminal.
Further, a kind of switch converters that the utility model provides, also has such feature: the voltage of power supply terminal is in order to the electric current of control flow check through switch terminal.
Further, a kind of switch converters that the utility model provides, also has such feature: electric capacity two ends are a resistance in parallel also, and the electric current that resistance flows through is in order to the electric current of control flow check through switch terminal.
Further, a kind of switch converters that the utility model provides, also has such feature: power supply terminal also connects at least one current source, flows through the electric current of current source in order to the electric current of control flow check through switch terminal.
Further, a kind of switch converters that the utility model provides, also has such feature: switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch; Power supply circuits are switch converters in-line power; Internal bias circuit by the voltage distribution of power supply circuits to other circuit units in switch converters; Difference current testing circuit flows through the average current of power supply terminal in order to detect, this electric current is supplied to constant-current control circuit as reference signal; On current testing circuit flows through the electric current of power switch in order to detect; Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls the break-make of power switch; The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
Further, a kind of switch converters that the utility model provides, also has such feature: switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit; Power supply circuits are with thinking switch converters in-line power; Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters; Difference current testing circuit is in order to detect the electric current generation current difference signal of power supply circuits output current and internal bias circuitry consumes, and this current difference signal is supplied to constant-current control circuit as reference signal; On current testing circuit flows through the electric current of power switch in order to detect; Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls power switch break-make; The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
Further, a kind of switch converters that the utility model provides, also has such feature: switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit; Power supply circuits provide foreign current for switch converters in-line power with for power supply terminal; Foreign current is detected by difference current testing circuit and feeds back to power supply circuits, makes foreign current constant; Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters; On current testing circuit flows through the electric current of power switch in order to detect; Constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls power switch break-make; The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
Further, a kind of switch converters that the utility model provides, also has such feature: switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit; Power supply circuits provide foreign current for switch converters in-line power with for power supply terminal; The difference between currents of difference current testing circuit detection power supply circuits output current and internal bias circuitry consumes to power supply circuits, makes foreign current constant as feedback signal back; Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters; On current testing circuit flows through the electric current of power switch in order to detect; Constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls power switch break-make; The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
In addition, the utility model also provides a kind of switch constant-current source, has above-mentioned switch converters.
Further, a kind of switch constant-current source that the utility model provides, also has such feature: also comprise a diode; When the power switch conducting of switch converters inside, the electric current of magnetic element rises, and when the power switch of switch converters inside turns off, the electric current of magnetic element declines via diode continuousing flow.
The technique effect that the utility model obtains is: achieve the simple switch converters of a kind of circuit, utilizes this switch converters can realize the switch constant-current source of low cost, and this switch converters and switch constant-current source all can utilize external signal to regulate electric current.
Accompanying drawing explanation
Fig. 1 is current common a kind of switch constant-current source circuit schematic diagram
Fig. 2 is the circuit diagram of the switch constant-current source of embodiment one.
Fig. 3 is the circuit diagram of the switch converters of embodiment one.
Fig. 4 is the circuit diagram of the switch constant-current source of embodiment two.
Fig. 5 is the circuit diagram of the switch converters of embodiment two.
Fig. 6 is the circuit diagram of the switch constant-current source of embodiment three.
Fig. 7 is the circuit diagram of the switch converters of embodiment three.
Fig. 8 is the circuit diagram of the switch constant-current source of embodiment four.
Fig. 9 is the circuit diagram of the switch converters of embodiment four.
Figure 10 is the circuit diagram of the switch constant-current source of embodiment five.
Figure 11 is the circuit diagram of the switch converters of embodiment five.
Figure 12 is the circuit diagram of the switch constant-current source of embodiment six.
Figure 13 is the circuit diagram of the switch converters of embodiment six.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment one
Fig. 2 is the circuit diagram of the switch constant-current source of embodiment one.
Switch constant-current source comprises power supply, sustained diode 1, magnetic element M1, switch converters, load, electric capacity C1 and resistance R1.
Switch converters comprises 3 terminals: in order to the switch terminal 1 of the current lead-through and shutoff that control magnetic element M1, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 1 exports with power supply and is connected, the anode of sustained diode 1 is connected with one end of magnetic element M1, the other end of magnetic element M1 is connected to power supply through load and exports, sustained diode 1 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M1, electric capacity C1, resistance R1 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Fig. 3 is the circuit diagram of the switch converters of embodiment one.
Switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch.
Power supply circuits are switch converters in-line power.
Internal bias circuit by the voltage distribution of power supply circuits to other circuit units in switch converters.
Difference current testing circuit flows through the average current of power supply terminal 2 in order to detect, this electric current is supplied to constant-current control circuit as reference signal.
On current testing circuit flows through the electric current of power switch in order to detect.
Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls the break-make of power switch.
When the power switch conducting of switch converters inside, the electric current of magnetic element M rises, when the power switch of switch converters inside turns off, the electric current of magnetic element M declines via diode D afterflow, the conducting duty ratio of the power switch of control switch converter inside, can make outputting current steadily at steady state value.
The electric current that resistance R1 flows through is the quotient of voltage divided by resistance R1 resistance at power supply terminal 2 two ends of switch converters, this quotient is detected by difference current testing circuit and in order to the electric current of control flow check through switch terminal 1, therefore, the electric current of magnetic element M1 and load is controlled.
Embodiment two
Fig. 4 is the circuit diagram of the switch constant-current source of embodiment two.
Switch constant-current source comprises power supply, sustained diode 2, magnetic element M2, switch converters, load, electric capacity C2 and resistance R2.
Switch converters comprises 3 terminals: in order to the switch terminal 1 of the current lead-through and shutoff that control magnetic element M2, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 2 exports with power supply and is connected, the anode of sustained diode 2 is connected with one end of magnetic element M2, the other end of magnetic element M2 is connected to power supply through load and exports, sustained diode 2 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M2, electric capacity C2, resistance R2 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Fig. 5 is the circuit diagram of the switch converters of embodiment two.
Switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit.
Power supply circuits are with thinking switch converters in-line power.
Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters.
Difference current testing circuit is in order to detect the electric current generation current difference signal of power supply circuits output current and internal bias circuitry consumes, and this current difference signal is supplied to constant-current control circuit as reference signal.
On current testing circuit flows through the electric current of power switch in order to detect.
Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls power switch break-make.
When the power switch conducting of switch converters inside, the electric current of magnetic element M2 rises, when the power switch of switch converters inside turns off, the electric current of magnetic element M2 declines via diode D2 afterflow, the conducting duty ratio of the power switch of control switch converter inside, can make outputting current steadily at steady state value.
The electric current that resistance R2 flows through is the quotient of voltage divided by resistance R2 resistance at power supply terminal 2 two ends of switch converters, this quotient is detected by difference current testing circuit and in order to the electric current of control flow check through switch terminal 1, therefore, the electric current of magnetic element M2 and load is controlled.
Embodiment three
Fig. 6 is the circuit diagram of the switch constant-current source of embodiment three.
Switch constant-current source comprises power supply, sustained diode 3, magnetic element M3, switch converters, load, electric capacity C3 and current source I3.
Switch converters comprises 3 terminals: in order to the switch terminal 1 of the current lead-through and shutoff that control magnetic element M3, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 3 exports with power supply and is connected, the anode of sustained diode 3 is connected with one end of magnetic element M3, the other end of magnetic element M3 is connected to power supply through load and exports, sustained diode 3 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M3, electric capacity C3, current source I3 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Fig. 7 is the circuit diagram of the switch converters of embodiment three.
Switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch.
Power supply circuits are switch converters in-line power.
Internal bias circuit by the voltage distribution of power supply circuits to other circuit units in switch converters.
Difference current testing circuit flows through the average current of power supply terminal 2 in order to detect, this electric current is supplied to constant-current control circuit as reference signal.
On current testing circuit flows through the electric current of power switch in order to detect.
Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls the break-make of power switch.
When power switch conducting, the electric current of magnetic element M3 rises, and when power switch turns off, the electric current of magnetic element M3 declines via diode D3 afterflow, controls the conducting duty ratio of power switch, outputting current steadily can be made at steady state value.
The electric current of current source I3 is detected by difference current testing circuit and in order to the electric current of control flow check through switch terminal 1, therefore, the electric current of magnetic element M3 and load is controlled.
Embodiment four
Fig. 8 is the circuit diagram of the switch constant-current source of embodiment four.
Switch constant-current source comprises power supply, sustained diode 4, magnetic element M4, switch converters, load, electric capacity C4 and current source I4.
Switch converters comprises 3 terminals: in order to control the switch terminal 1 of magnetic element M4 turn-on and turn-off electric current, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 4 exports with power supply and is connected, the anode of sustained diode 4 is connected with one end of magnetic element M4, the other end of magnetic element M4 is connected to power supply through load and exports, sustained diode 4 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M4, electric capacity C4, current source I4 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Fig. 9 is the circuit diagram of the switch converters of embodiment four.
Switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit.
Power supply circuits are with thinking switch converters in-line power.
Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters.
Difference current testing circuit is in order to detect the electric current generation current difference signal of power supply circuits output current and internal bias circuitry consumes, and this current difference signal is supplied to constant-current control circuit as reference signal.
On current testing circuit flows through the electric current of power switch in order to detect.
Constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls power switch break-make.
When power switch conducting, the electric current of magnetic element M4 rises, and when power switch turns off, the electric current of magnetic element M4 declines via diode D4 afterflow, controls the conducting duty ratio of power switch, outputting current steadily can be made at steady state value.
The electric current of current source I4 is detected by difference current testing circuit and in order to the electric current of control flow check through switch terminal 1, therefore, the electric current of magnetic element M4 and load is controlled.
Embodiment five
Figure 10 is the circuit diagram of the switch constant-current source of embodiment one.
Switch constant-current source comprises power supply, sustained diode 5, magnetic element M5, switch converters, load, electric capacity C5 and resistance R5.
Switch converters comprises 3 terminals: in order to the switch terminal 1 of the current lead-through and shutoff that control magnetic element M5, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 5 exports with power supply and is connected, the anode of sustained diode 5 is connected with one end of magnetic element M5, the other end of magnetic element M5 is connected to power supply through load and exports, sustained diode 5 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M5, electric capacity C5, resistance R5 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Figure 11 is the circuit diagram of the switch converters of embodiment five.
Switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch.
Power supply circuits provide foreign current for switch converters in-line power with for power supply terminal; Foreign current is detected by difference current testing circuit and feeds back to power supply circuits, makes foreign current constant.
Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters.
On current testing circuit flows through the electric current of power switch in order to detect;
Constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls power switch break-make.
The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
When power switch conducting, the electric current of magnetic element M5 rises, and when power switch turns off, the electric current of magnetic element M5 declines via diode D5 afterflow, controls the conducting duty ratio of power switch, outputting current steadily can be made at steady state value.
The foreign current that power supply terminal flows out produces the voltage signal be directly proportional to R5 resistance at resistance R5 two ends, this voltage signal is in order to the electric current of control flow check through switch terminal 1, and therefore, the electric current of magnetic element M5 and load is controlled.
Embodiment five
Figure 12 is the circuit diagram of the switch constant-current source of embodiment six.
Switch constant-current source comprises power supply, sustained diode 6, magnetic element M6, switch converters, load, electric capacity C6 and resistance R6.
Switch converters comprises 3 terminals: in order to the switch terminal 1 of the current lead-through and shutoff that control magnetic element M6, the power supply terminal 2 of powering for switch converters internal circuit and for the public terminal 3 with reference to ground level.
The negative electrode of sustained diode 6 exports with power supply and is connected, the anode of sustained diode 6 is connected with one end of magnetic element M6, the other end of magnetic element M6 is connected to power supply through load and exports, sustained diode 6 is connected to the switch terminal 1 of switch converters with the joint of magnetic element M6, electric capacity C6, resistance R6 to be connected in parallel between power supply terminal 2 and ground respectively in order to slicked switch converter voltage and the electric current of switch constant-current source is set.
Figure 13 is the circuit diagram of the switch converters of embodiment six.
Switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch.
Power supply circuits provide foreign current for switch converters in-line power with for power supply terminal.
The difference between currents of difference current testing circuit detection power supply circuits output current and internal bias circuitry consumes to power supply circuits, makes foreign current constant as feedback signal back.
Internal bias circuit in order to by the voltage distribution of power supply circuits to other circuit units in switch converters.
On current testing circuit flows through the electric current of power switch in order to detect.
Constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls power switch break-make.
The break-make control flow check of power switch, through the slope of magnetic element, realizes controlling the output current of switch constant-current source.
When power switch conducting, the electric current of magnetic element M6 rises, and when power switch turns off, the electric current of magnetic element M6 declines via diode D6 afterflow, controls the conducting duty ratio of power switch, outputting current steadily can be made at steady state value.
The foreign current that power supply terminal flows out produces the voltage signal be directly proportional to R6 resistance at resistance R6 two ends, this voltage signal is in order to the electric current of control flow check through switch terminal 1, and therefore, the electric current of magnetic element M6 and load is controlled.
Above-described embodiment is to illustrate instead of limiting the utility model, and under the prerequisite of protection range not departing from claims, this programme also has various change, and these changes and improvements all will fall in the claimed scope of the utility model.Word " comprises " or does not get rid of " comprising " existence of element or step different elements or the step listed in those and claim, element "a" or "an" does not get rid of the existence of multiple element, in the claim enumerating several circuit, several in these circuit can show by one, electronic device item is also same, only because some method describes in mutually different dependent claims, do not illustrate that the combination of these methods can not be used for making a profit.
Claims (11)
1. a switch converters for control switch constant-current source, described switch constant-current source comprises at least one magnetic element, it is characterized in that:
Described switch converters control flow check, through the electric current of the magnetic element of described switch constant-current source, realizes the control to described switch constant-current source output current;
Described switch converters comprises at least three terminals: control flow check, through the switch terminal of the magnetic element electric current of described switch constant-current source, is the power supply terminal of described switch converters in-line power and the public terminal for described switch converters internal reference ground level; Between described power supply terminal and described public terminal, an electric capacity in parallel is with the supply power voltage of level and smooth described switch converters.
2. switch converters according to claim 1, is characterized in that: flow through the electric current of described power supply terminal in order to the electric current of control flow check through described switch terminal.
3. switch converters according to claim 1, is characterized in that: the voltage of described power supply terminal is in order to the electric current of control flow check through described switch terminal.
4. switch converters according to claim 1, is characterized in that: described electric capacity two ends are a resistance in parallel also, and the electric current that described resistance flows through is in order to the electric current of control flow check through described switch terminal.
5. switch converters according to claim 1, is characterized in that: described power supply terminal also connects at least one current source, flows through the electric current of described current source in order to the electric current of control flow check through described switch terminal.
6. switch converters according to claim 1, is characterized in that: described switch converters comprises power supply circuits, internal bias circuit, difference current testing circuit, On current testing circuit, constant-current control circuit and power switch;
Described power supply circuits are described switch converters in-line power;
Described internal bias circuit by the voltage distribution of described power supply circuits to other circuit units in described switch converters;
Described difference current testing circuit flows through the average current of power supply terminal in order to detect, this electric current is supplied to constant-current control circuit as reference signal;
Described On current testing circuit flows through the electric current of described power switch in order to detect;
Described constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls the break-make of described power switch;
The break-make control flow check of described power switch, through the slope of described magnetic element, realizes controlling the output current of described switch constant-current source.
7. switch converters according to claim 1, is characterized in that: described switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit;
Described power supply circuits are with thinking described switch converters in-line power;
Described internal bias circuit in order to by the voltage distribution of described power supply circuits to other circuit units in described switch converters;
Described difference current testing circuit is in order to detect the electric current generation current difference signal of described power supply circuits output current and described internal bias circuitry consumes, and this current difference signal is supplied to constant-current control circuit as reference signal;
Described On current testing circuit flows through the electric current of described power switch in order to detect;
Described constant-current control circuit receives the signal coming from difference current testing circuit and On current testing circuit, produces driving pulse, controls described power switch break-make;
The break-make control flow check of described power switch, through the slope of described magnetic element, realizes controlling the output current of described switch constant-current source.
8. switch converters according to claim 1, is characterized in that: described switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit;
Described power supply circuits provide foreign current for described switch converters in-line power with for described power supply terminal; Described foreign current is detected by described difference current testing circuit and feeds back to power supply circuits, makes described foreign current constant;
Described internal bias circuit in order to by the voltage distribution of described power supply circuits to other circuit units in described switch converters;
Described On current testing circuit flows through the electric current of described power switch in order to detect;
Described constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls described power switch break-make;
The break-make control flow check of described power switch, through the slope of described magnetic element, realizes controlling the output current of described switch constant-current source.
9. switch converters according to claim 1, is characterized in that: described switch converters comprises power supply circuits, internal bias circuit, constant-current control circuit, On current testing circuit, power switch and difference current testing circuit;
Described power supply circuits provide foreign current for described switch converters in-line power with for described power supply terminal;
The difference between currents that described difference current testing circuit detects described power supply circuits output current and described internal bias circuitry consumes to power supply circuits, makes described foreign current constant as feedback signal back;
Described internal bias circuit in order to by the voltage distribution of described power supply circuits to other circuit units in described switch converters;
Described On current testing circuit flows through the electric current of described power switch in order to detect;
Described constant-current control circuit receives and comes from the voltage signal of power supply terminal and the signal of On current testing circuit, produces driving pulse, controls described power switch break-make;
The break-make control flow check of described power switch, through the slope of described magnetic element, realizes controlling the output current of described switch constant-current source.
10. a switch constant-current source, is characterized in that, has the switch converters as described in any one as described in claim 1 to 9.
11. switch constant-current sources according to claim 10, is characterized in that: also comprise a diode; When the power switch conducting of described switch converters inside, the electric current of magnetic element rises, and when the power switch of described switch converters inside turns off, the electric current of magnetic element declines via described diode continuousing flow.
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| CN201520510202.0U CN204761289U (en) | 2015-07-14 | 2015-07-14 | Switch converter and switch constant current source |
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| CN201520510202.0U CN204761289U (en) | 2015-07-14 | 2015-07-14 | Switch converter and switch constant current source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967289A (en) * | 2015-07-14 | 2015-10-07 | 上海路千电子科技有限公司 | Switch controller and application thereof |
-
2015
- 2015-07-14 CN CN201520510202.0U patent/CN204761289U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967289A (en) * | 2015-07-14 | 2015-10-07 | 上海路千电子科技有限公司 | Switch controller and application thereof |
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Address after: 200030 room 6B9, No. 481, Guiping Road, Xuhui District, Shanghai, 15 rooms Patentee after: SHANGHAI LUAO ELECTRONIC TECHNOLOGY CO., LTD. Address before: 201109 E876 first, 5500 Yuanjiang Road, Minhang District, Shanghai. Patentee before: Shanghai Luqian Electronic Technology Co., Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
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Denomination of utility model: Switching converter and switching constant current source Effective date of registration: 20200916 Granted publication date: 20151111 Pledgee: Industrial Bank Co., Ltd. Shanghai Minhang sub branch Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2020980006113 |
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Date of cancellation: 20220210 Granted publication date: 20151111 Pledgee: Industrial Bank Co.,Ltd. Shanghai Minhang sub branch Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2020980006113 |