CN201039034Y - Power converter and its impulse bandwidth modulation controller - Google Patents
Power converter and its impulse bandwidth modulation controller Download PDFInfo
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- CN201039034Y CN201039034Y CNU2006201647594U CN200620164759U CN201039034Y CN 201039034 Y CN201039034 Y CN 201039034Y CN U2006201647594 U CNU2006201647594 U CN U2006201647594U CN 200620164759 U CN200620164759 U CN 200620164759U CN 201039034 Y CN201039034 Y CN 201039034Y
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Abstract
The utility model discloses a PWM controller, which comprises an open-circuit detection circuit which carries out output power restriction when a photocoupler open-circuit is invalidated; the input terminal of the open-circuit detection circuit is connected with the output terminal of the PWM controller; the output terminal of the open-circuit detection circuit is connected with a PWM logic circuit of the PWM controller; the open-circuit detection circuit comprises a comparator, a sampling circuit and a latch circuit; wherein, the sampling terminal of the sampling circuit is controlled by an interior clock of the PWM controller. The utility model also discloses a power supply converter which comprises the PWM controller, a transformer, a power transistor, a photocoupler, and an emitter driving reverse excitation circuit. By adopting the technical proposal of the utility model, the cost of the system is low; furthermore, the input power of the power supply converter is reduced, in order to protect the power supply converter, on the conditions of broken feedback circuit caused by the photocoupler open-circuit and other open-circuits.
Description
Technical field
The utility model relates to the field of power management that the employing pulse width modulation mode carries out power conversion; more particularly; relate to low power pulse width modulation controlled scheme, especially have the PWM controller of open-circuit-protection and the flyback power supply translation circuit that adopts emitter to drive.
Background technology
Pulse width modulation (PWM) technology is in the widely used technology of field of power conversion, can be used for controlling and adjustment output voltage and power output in the AC-DC of the adapter of realizing portable equipment and charger scheme uses.The scheme of present small power electric source converter can be classified like this: the first kind, the former limit of transformer circuit adopt the RCC discrete device to form the separate excitation control of self-excitation control or the formation of PWM controller.Second class, transformer time limit employing double operational circuit is realized constant current, voltage reference circuit is realized constant voltage, or adopts voltage reference circuit to realize constant voltage and triode realization constant current.The 3rd class, the ASIC scheme is promptly saved optocoupler and secondary constant pressure and flow controller, only adopts the application-specific integrated circuit (ASIC) on former limit just can realize the constant pressure and flow of output voltage is controlled.Though first kind scheme is simple, shortcoming also is significantly, mainly contains: the device discreteness is big, efficient is low, no short-circuit function, production capacity are low etc., so be eliminated gradually.The ASIC scheme is slightly simple, but has only few manufacturer that technical capability is arranged, owing to there is not strict electric current and voltage control loop, so the ripple of system and noise are all poor, cost is also higher, so still can not satisfy the needs of high-end customer.The second class scheme is by extensive use, systematic function can satisfy the constant pressure and flow requirement of most high-performance battery charger schemes, and the variation of ambient temperature does not have tangible influence to the performance of system, but the system cost height, board area is big, and some clients hang back.
In actual use, more than any scheme all need to add various defencive functions such as over-voltage and over-current, permanent power, short circuit and open-circuit-protection, protect whole supply convertor, in order to avoid cause nonvolatil damage.For example widely used at present various PWM controllers nearly all are second kind of schemes, and adopt gate driving, and the power input of monitoring PWM controller is realized open circuit protecting function.The emitter type of drive can reduce the pin of PWM controller, compares with other PWM controller, has reduced system cost.Because its power input is the optocoupler feedback end simultaneously; this terminal voltage of optocoupler open circuit back descends; enter the pattern of restarting then; play the certain protection effect; but the input power of this moment is still bigger; easily generating device is overheated and the danger of aircraft bombing occurs, so need to seek new open-circuit-protection method and better the PWM controller and the supply convertor of emitter type of drive.
The utility model content
The purpose of this utility model provides a kind of flyback power supply translation circuit that has the PWM controller of open-circuit-protection and adopt the emitter driving of this PWM controller; this circuit can cause under the situation of feedback control loop disconnection at optocoupler open circuit and other; reduce the input power of supply convertor, reach protection supply convertor.
According to one side of the present utility model, a kind of pulse width modulation (PWM) controller is provided, described PWM controller comprises open detection circuit, when the optocoupler open failure, carry out the power output restriction, the input of open detection circuit is connected the output of this PWM controller, and the output of open detection circuit is received the PWM logical circuit of this PWM controller; This open detection circuit comprises comparator, sample circuit and latch cicuit, and wherein sample circuit is controlled its sampling end by the internal clocking of PWM controller.
According to an embodiment of the present utility model, this PWM controller comprises: start-up circuit is connected the minimum operating voltage of decision power input when starting instantaneous threshold operating voltage and operate as normal with the output drive end with power input; Under-voltage comparator is controlled described start-up circuit, an input termination power input of under-voltage comparator, and output is connected to start-up circuit; Clock circuit is used to produce the square-wave signal of fixed frequency; The PWM logical circuit is connected to the output of clock circuit, is also connected to the output of under-voltage comparator; Error amplifier, an input termination power input, output voltage feedback signal; The PWM comparator, an input is connected to the output of error amplifier; The current peak comparator, an input connects current sampling resistor, and response is connected to the current sampling signal of the output driving circuit of output drive end, realizes the current loop feedback; The line voltage compensation circuit, it exports the output addition with the current peak comparator, receives another input of PWM comparator as current feedback signal; Short-circuit detecting circuit detects short trouble, and input is connected to the output of PWM controller, and the PWM logical circuit is received in output; Open detection circuit is carried out the power output restriction when the optocoupler open failure, input is received the output of PWM controller, and the PWM logical circuit is received in output; Reference voltage and biasing circuit are for this PWM controller provides several reference voltages and bias current; Wherein, current feedback signal and voltage feedback signal will be applied to the PWM logical circuit with the form of error signal by the PWM comparator; The PWM logical circuit is connected to the output square-wave signal that clock circuit is used to respond oscillator; be also connected to the error signal of PWM comparator received current peak comparator and error amplifier; the duty ratio of decision output driving pulse; described PWM logical circuit also responds the output signal of short-circuit detecting circuit, open detection circuit and under-voltage comparator; and periodicity is turn-offed output signal conditionally; come protection system, the output of PWM logic is received an internal power device and is driven by being connected to the power transistor of the outside of exporting the drive end connection.
According to an embodiment of the present utility model, described reference voltage and biasing circuit provide 4 reference voltages, and first reference voltage offers another input of under-voltage comparator; Second reference voltage offers another input of error amplifier; The 3rd reference voltage offers another input of current peak comparator; The 4th reference voltage offers open detection circuit.And first reference voltage offers the negative input end of under-voltage comparator; Second reference voltage offers the positive input terminal of error amplifier; The 3rd reference voltage offers the negative input end of current peak comparator.
According to an embodiment of the present utility model, described open detection circuit comprises: comparator, and an input is connected on the output of PWM controller, and another input receives the 4th reference voltage; Sample circuit, the control end that is connected to the output sample circuit of comparator is received the clock circuit of PWM controller; Latch cicuit is connected to the output of sample circuit, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
According to an embodiment of the present utility model, described open detection circuit comprises: sample circuit, be connected to the output of PWM controller, and the control end of sample circuit is received the clock circuit of PWM controller; Comparator, an input is connected on the output of sample circuit, and another input receives the 4th reference voltage; Latch cicuit is connected to the output of comparator, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
Wherein, described sample circuit by or the door constitute, perhaps, described sample circuit is made of transmission gate and storage capacitance.
According on the other hand of the present utility model, a kind of supply convertor is provided, comprising: as each described PWM controller in the claim 1 to 6, transformer; Power tube; Optocoupler; And emitter drives circuit of reversed excitation.
According to an embodiment of the present utility model, described emitter drives circuit of reversed excitation and comprises one group of resistance, electric capacity and voltage reference circuit.
PWM controller of the present utility model and flyback power supply translation circuit adopt emitter to drive; system cost is lower; and can cause reducing the input power of supply convertor under the situation of feedback control loop disconnection at optocoupler open circuit and other, reach protection supply convertor.
Description of drawings
The above and other feature of the present utility model, character and advantage will further describe below in conjunction with the accompanying drawings and embodiments, and identical in the accompanying drawings Reference numeral is represented identical feature all the time, wherein,
Fig. 1 is the circuit diagram of an embodiment of supply convertor of the present utility model;
Fig. 2 is the circuit block diagram of an embodiment of PWM controller of the present utility model;
Fig. 3 is an embodiment circuit block diagram of the open detection circuit of PWM controller of the present utility model;
Fig. 4 is the circuit block diagram of another embodiment of the open detection circuit of PWM controller of the present utility model;
Fig. 5 is the wavy curve of the main signal of the embodiment shown in Fig. 3,4;
Fig. 6 is the physical circuit figure of an embodiment of the open detection circuit of PWM controller of the present utility model;
Fig. 7 is the physical circuit figure of another embodiment of the open detection circuit of PWM controller of the present utility model.
Embodiment
The PWM controller
The utility model at first provides a kind of pulse width modulation (PWM) controller, this PWM controller comprises open detection circuit, when the optocoupler open failure, carry out the power output restriction, the input of this open detection circuit is connected the output of this PWM controller, and the output of open detection circuit is received the PWM logical circuit of this PWM controller; This open detection circuit comprises comparator, sample circuit and latch cicuit, and wherein sample circuit is controlled its sampling end by the internal clocking of PWM controller.
According to an embodiment, this PWM controller comprises:
Start-up circuit is connected the minimum operating voltage of decision power input when starting instantaneous threshold operating voltage and operate as normal with the output drive end with power input;
Under-voltage comparator is controlled described start-up circuit, an input termination power input of under-voltage comparator, and output is connected to start-up circuit;
Clock circuit is used to produce the square-wave signal of fixed frequency;
The PWM logical circuit is connected to the output of clock circuit, is also connected to the output of under-voltage comparator;
Error amplifier, an input termination power input, output voltage feedback signal;
The PWM comparator, an input is connected to the output of error amplifier;
The current peak comparator, an input connects current sampling resistor, and response is connected to the current sampling signal of the output driving circuit of output drive end, realizes the current loop feedback;
The line voltage compensation circuit, it exports the output addition with the current peak comparator, receives another input of PWM comparator as current feedback signal;
Short-circuit detecting circuit detects short trouble, and input is connected to the output of PVVM controller, and the PWM logical circuit is received in output;
Open detection circuit is carried out the power output restriction when the optocoupler open failure, input is received the output of PWM controller, and the PWM logical circuit is received in output;
Reference voltage and biasing circuit are for this PWM controller provides several reference voltages and bias current; According to an embodiment, this reference voltage and biasing circuit provide 4 reference voltages, and first reference voltage offers another input of under-voltage comparator; Second reference voltage offers another input of error amplifier; The 3rd reference voltage offers another input of current peak comparator; The 4th reference voltage offers open detection circuit.And first reference voltage offers the negative input end of under-voltage comparator; Second reference voltage offers the positive input terminal of error amplifier; The 3rd reference voltage offers the negative input end of current peak comparator.
Wherein, current feedback signal and voltage feedback signal will be applied to the PWM logical circuit with the form of error signal by the PWM comparator; The PWM logical circuit is connected to the output square-wave signal that clock circuit is used to respond oscillator; be also connected to the error signal of PWM comparator received current peak comparator and error amplifier; the duty ratio of decision output driving pulse; described PWM logical circuit also responds the output signal of short-circuit detecting circuit, open detection circuit and under-voltage comparator; and periodicity is turn-offed output signal conditionally; come protection system, the output of PWM logic is received an internal power device and is driven by being connected to the power transistor of the outside of exporting the drive end connection.
According to an embodiment, this open detection circuit comprises: comparator, and an input is connected on the output of PWM controller, and another input receives the 4th reference voltage; Sample circuit is connected to the output of comparator, and the control end of sample circuit is received the clock circuit of PWM controller; Latch cicuit is connected to the output of sample circuit, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
According to another embodiment, this open detection circuit comprises: sample circuit, be connected to the output of PWM controller, and the control end of sample circuit is received the clock circuit of PWM controller; Comparator, an input is connected on the output of sample circuit, and another input receives the 4th reference voltage; Latch cicuit is connected to the output of comparator, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
Sample circuit in the above-mentioned open detection circuit can by or the door constitute, also can constitute by transmission gate and storage capacitance.
PWM controller example
With reference to figure 2, Fig. 2 is the circuit block diagram of an embodiment of PWM controller of the present utility model, it has four signals of outwards drawing, OUT is the output that drives the external power pipe, VCC is the power supply input anode of this circuit, CS is the input of detection line change in voltage, and GND is the power supply negative terminal of circuit.This PWM controller 20 comprises:
Start-up circuit 201, circuit is connected with output drive end OUT with power supply input anode VCC, and by under-voltage comparator 202 controls, this circuit has determined the minimum operating voltage of this power input when starting instantaneous threshold operating voltage and operate as normal; Clock circuit 209 is used to produce the square-wave signal of fixed frequency; Its output is connected to PWM logical circuit 206; One input termination power input of under-voltage comparator 202, start-up circuit 201 and PWM logical circuit 206 are received in its output respectively; One input termination power input of error amplifier 203, the voltage feedback signal of output is received an input of PWM comparator 204; Current peak comparator 210, wherein an input connects current sampling resistor 213, the current sampling signal of response output driving circuit, realization current loop feedback, described current peak comparator 210 is exported the output addition with line voltage compensation circuit 211, receives another input of PWM comparator 204 as current feedback signal; Current feedback signal and voltage feedback signal will be applied to PWM logical circuit 206 with the form of error signal by PWM comparator 204; PWM logical circuit 206, be connected to the output square-wave signal that clock circuit 209 is used to respond oscillator, be also connected to the error signal of PWM comparator 204 received current peak comparators and error amplifier, the duty ratio of decision output driving pulse, described logical circuit also responds short-circuit detecting circuit 208 and the output signal of open a way detection 207, under-voltage comparator 202, and periodicity is turn-offed output signal conditionally, come protection system, 206 outputs of PWM logic are received inner power device 212 and are driven the power transistor of PWM controller 20 outsides; Short-circuit detecting circuit 208, one inputs are connected to the output OUT of PWM controller 20, and PWM logical circuit 206 is received in output; Open detection circuit 207 1 terminates to the output OUT of PWM controller 20, and PWM logical circuit 206 is received in output; Reference voltage and biasing circuit 205 provide each reference voltage Vref 1, Vref2, Vref3, Vref4 and bias current for this PWM controller, wherein first reference voltage Vref 1 offers another input of under-voltage comparator 202, provides negative input end to under-voltage comparator 202 according to embodiment shown in Figure 2; Second reference voltage Vref 2 offers another input of error amplifier 203, provides positive input terminal to error amplifier 203 according to embodiment shown in Figure 2; The 3rd reference voltage Vref 3 offers another input of current peak comparator 210, provides the negative input end of current peak comparator 210 according to embodiment shown in Figure 2; The 4th reference voltage Vref 4 offers open detection circuit 207.
With reference to figure 3 and Fig. 4, Fig. 3 and Fig. 4 are respectively two embodiment circuit block diagrams of the open detection circuit of PWM controller of the present utility model.
The structure of open detection circuit 207 shown in Figure 3 is as follows: comparator 270, one inputs are connected on the output OUT of PWM controller, and another input receives the 4th reference voltage Vref 4; Sample circuit 271 is connected to the output of comparator 270, and the control end of sample circuit 271 is received the clock circuit 209 of PWM controller; Latch cicuit 272 is connected to the output of sample circuit 271, and the level signal of latch cicuit 272 outputs is connected to the PWM logical circuit 206 of PWM controller.
The structure of open detection circuit 207 shown in Figure 4 is as follows: sample circuit 271, be connected to the output OUT of PWM controller, and the control end of sample circuit 271 is received the clock circuit 209 of PWM controller; Comparator 270, one inputs are connected on the output of sample circuit 271, and another input receives the 4th reference voltage Vref 4; Latch cicuit 272 is connected to the output of comparator 270, and the level signal of latch cicuit 272 outputs is connected to the PWM logical circuit 206 of PWM controller.
Fig. 3, open detection circuit 207 shown in Figure 4 all are to comprise comparator 270, sample circuit 271, latch cicuit 272.When PWM controller operate as normal, the OUT end is constantly exported the square wave of different duty, so need sample circuit 271 only under the voltage sample and preservation of PWM controller 20 blocking intervals with the OUT end, pass through the processing of latch cicuit 272 again, send into PWM logical circuit 206, the duty ratio of square wave is exported or reduced to export to realization disable switch square wave.The difference that is not both Fig. 3 and Fig. 4 to the order of the sampling of OUT terminal voltage and comparison.
Fig. 5 is the waveform schematic diagram of the main signal of the embodiment shown in Fig. 3,4.Iopto is the optocoupler electric current, and electric current was zero when the optocoupler open circuit took place.The VCC terminal voltage of PWM controller is descended, and the duty ratio of the square wave of output increases, and the voltage of the Vout of secondary is risen.Swash the voltage effect by transformer 10 anti-, the voltage of auxiliary winding 102 rises, and the voltage Vc5 on the capacitor C 5 after the rectification is risen.So the voltage of the OUT of PWM controller end when turn-offing also rises.When the OUT terminal voltage reached predeterminated voltage, at this moment open detection circuit did not have energy to provide to secondary to PWM logical circuit 206 output cut-off signals, and Vout will descend, and Vc5 is also because the OUT of PWM controller 20 holds conductive discharge and slowly decline.After dropping to under-voltage level, restarts the VCC of fault elimination or PWM controller 20.
Fig. 6 is the physical circuit figure of an embodiment of the open-circuit-protection mode circuit of PWM controller of the present utility model, in the embodiment shown in fig. 6, sample circuit by or door realize.Wherein, comparator 270 is after the OUT terminal voltage is higher than Vref4; through inverter 116 output low levels; be connected to by or the sample circuit 271 that constitutes of door; when CLK is high level, promptly before the PWM switch conduction, allow the output of comparator to be delivered to latch cicuit 272; the HIC here is the output signal of short-circuit detecting circuit, for simplifying circuit and the shared latch cicuit of open-circuit-protection.One input of latch cicuit 272 is accepted the output low level of sample circuit 271, make output Q end output high level, and before another input signal RESET of latch cicuit 272 is effective, the Q end that always remains on current period is high state, is used to control the pwm pulse output of forbidding following one-period.
Fig. 7 is the physical circuit figure of another embodiment of the open-circuit-protection mode circuit of PWM controller of the present utility model; Compare with Fig. 6, be that sample circuit 271 uses transmission gate and storage capacitance to realize the function of sampling.
Supply convertor
Another aspect of the present invention provides a kind of supply convertor, comprising: above-mentioned PWM controller, transformer, power tube, optocoupler; And emitter drives circuit of reversed excitation.Wherein, emitter driving circuit of reversed excitation comprises one group of resistance, electric capacity and voltage reference circuit.
The supply convertor example
Fig. 1 is the circuit diagram of an embodiment of supply convertor of the present utility model.Comprise above-mentioned PWM controller 20, transformer 10, power tube Q0, optocoupler 30 and drive circuit of reversed excitation, constitute the flyback power supply translation circuit that an emitter drives jointly by the emitter that auxiliary element is formed.Feedback control loop comprises resistance R 58, R57, R56, capacitor C 23, voltage reference circuit D13.The operation principle of this circuit is: by the drive end OUT of the line voltage Vin after the rectification via resistance R 0, PWM controller 20, the startup energy is provided for power input VCC, finishes the start-up course of system; The power supply energy of PWM controller 20 then mainly is provided by the auxiliary winding 102 of transformer 10 during operate as normal.PWM controller 20 driving power pipe Q0, the winding 100 by transformer 10 and 101 provides energy to the Vout end, and the voltage of Vout end is raise; When Vout arrives rated voltage, by feedback control loop, make optocoupler 30 conductings, the VCC terminal voltage of PWM controller is raise, thereby reduce to export duty of ratio, reduce to be delivered to the energy of Vout end, make Vout keep constant.
When open fault appears in feedback control loop, during such as optocoupler 30 open circuits, VCC will descend gradually, and peak current Ipk will increase, and from following formula as can be known, the power output of transmitting to the Vout end becomes big, the rising of Vout terminal voltage.
By anti-sharp process; the Vout change in voltage is reflected as the anti-voltage rising that swashs by the auxiliary winding 102 of transformer 10; through diode D2, capacitor C 5 rectifications; be knot by Q0; this variation can be detected by the OUT end of PWM controller; thereby promptly make open loop protection circuit work, avoid power output excessive.
PWM controller of the present utility model and flyback power supply translation circuit adopt emitter to drive; system cost is lower; and can cause reducing the input power of supply convertor under the situation of feedback control loop disconnection at optocoupler open circuit and other, reach protection supply convertor.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present utility model; those skilled in the art can be under the situation that does not break away from invention thought of the present utility model; the foregoing description is made various modifications or variation; thereby protection range of the present utility model do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (10)
1. a pulse width modulation (PWM) controller is characterized in that, described PWM controller comprises open detection circuit, carries out the power output restriction when the optocoupler open failure,
The input of open detection circuit is connected the output of this PWM controller, and the output of open detection circuit is received the PWM logical circuit of this PWM controller;
This open detection circuit comprises comparator, sample circuit and latch cicuit, and wherein sample circuit is controlled its sampling end by the internal clocking of PWM controller.
2. a pulse width modulation (PWM) controller is characterized in that, comprising:
Start-up circuit is connected the minimum operating voltage of decision power input when starting instantaneous threshold operating voltage and operate as normal with the output drive end with power input;
Under-voltage comparator is controlled described start-up circuit, an input termination power input of under-voltage comparator, and output is connected to start-up circuit;
Clock circuit is used to produce the square-wave signal of fixed frequency;
The PWM logical circuit is connected to the output of clock circuit, is also connected to the output of under-voltage comparator;
Error amplifier, an input termination power input, output voltage feedback signal;
The PWM comparator, an input is connected to the output of error amplifier;
The current peak comparator, an input connects current sampling resistor, and response is connected to the current sampling signal of the output driving circuit of output drive end, realizes the current loop feedback;
The line voltage compensation circuit, it exports the output addition with the current peak comparator, receives another input of PWM comparator as current feedback signal;
Short-circuit detecting circuit detects short trouble, and input is connected to the output of PWM controller, and the PWM logical circuit is received in output;
Open detection circuit is carried out the power output restriction when the optocoupler open failure, input is received the output of PWM controller, and the PWM logical circuit is received in output;
Reference voltage and biasing circuit are for this PWM controller provides several reference voltages and bias current;
Wherein, current feedback signal and voltage feedback signal will be applied to the PWM logical circuit with the form of error signal by the PWM comparator; The PWM logical circuit is connected to the output square-wave signal that clock circuit is used to respond oscillator; be also connected to the error signal of PWM comparator received current peak comparator and error amplifier; the duty ratio of decision output driving pulse; described PWM logical circuit also responds the output signal of short-circuit detecting circuit, open detection circuit and under-voltage comparator; and periodicity is turn-offed output signal conditionally; come protection system, the output of PWM logic is received an internal power device and is driven by being connected to the power transistor of the outside of exporting the drive end connection.
3. PWM controller as claimed in claim 2 is characterized in that, described reference voltage and biasing circuit provide 4 reference voltages,
First reference voltage offers another input of under-voltage comparator;
Second reference voltage offers another input of error amplifier;
The 3rd reference voltage offers another input of current peak comparator;
The 4th reference voltage offers open detection circuit.
4. PWM controller as claimed in claim 3 is characterized in that,
First reference voltage offers the negative input end of under-voltage comparator;
Second reference voltage offers the positive input terminal of error amplifier;
The 3rd reference voltage offers the negative input end of current peak comparator.
5. PWM controller as claimed in claim 3 is characterized in that, described open detection circuit comprises:
Comparator, an input is connected on the output of PWM controller, and another input receives the 4th reference voltage;
Sample circuit is connected to the output of comparator, and the control end of sample circuit is received the clock circuit of PWM controller;
Latch cicuit is connected to the output of sample circuit, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
6. PWM controller as claimed in claim 3 is characterized in that, described open detection circuit comprises:
Sample circuit is connected to the output of PWM controller, and the control end of sample circuit is received the clock circuit of PWM controller;
Comparator, an input is connected on the output of sample circuit, and another input receives the 4th reference voltage;
Latch cicuit is connected to the output of comparator, and the level signal of latch cicuit output is connected to the PWM logical circuit of PWM controller.
7. as claim 5 or 6 described PWM controllers, it is characterized in that, described sample circuit by or the door constitute.
8. as claim 5 or 6 described PWM controllers, it is characterized in that described sample circuit is made of transmission gate and storage capacitance.
9. a supply convertor is characterized in that, comprising:
As each described PWM controller in the claim 2 to 6,
Transformer;
Power tube;
Optocoupler; And
Emitter drives circuit of reversed excitation.
10. supply convertor as claimed in claim 9 is characterized in that,
Described emitter drives circuit of reversed excitation and comprises one group of resistance, electric capacity and voltage reference circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201647594U CN201039034Y (en) | 2006-12-30 | 2006-12-30 | Power converter and its impulse bandwidth modulation controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201647594U CN201039034Y (en) | 2006-12-30 | 2006-12-30 | Power converter and its impulse bandwidth modulation controller |
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| Publication Number | Publication Date |
|---|---|
| CN201039034Y true CN201039034Y (en) | 2008-03-19 |
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| CNU2006201647594U Expired - Lifetime CN201039034Y (en) | 2006-12-30 | 2006-12-30 | Power converter and its impulse bandwidth modulation controller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634678B (en) * | 2009-08-27 | 2011-07-20 | 中国北车集团大连机车研究所有限公司 | Functional test platform of auxiliary power supply converter of internal-combustion engine locomotive |
| CN102386901A (en) * | 2010-08-31 | 2012-03-21 | 富士通半导体股份有限公司 | Output switching circuit |
| CN102709880A (en) * | 2012-06-07 | 2012-10-03 | 无锡市晶源微电子有限公司 | Module with optocoupler protection function |
| CN101552570B (en) * | 2009-04-17 | 2013-09-18 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit with frequency limiting function and method |
-
2006
- 2006-12-30 CN CNU2006201647594U patent/CN201039034Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552570B (en) * | 2009-04-17 | 2013-09-18 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit with frequency limiting function and method |
| CN101634678B (en) * | 2009-08-27 | 2011-07-20 | 中国北车集团大连机车研究所有限公司 | Functional test platform of auxiliary power supply converter of internal-combustion engine locomotive |
| CN102386901A (en) * | 2010-08-31 | 2012-03-21 | 富士通半导体股份有限公司 | Output switching circuit |
| US8957648B2 (en) | 2010-08-31 | 2015-02-17 | Spansion Llc | Output switching circuit |
| CN102386901B (en) * | 2010-08-31 | 2015-04-22 | 斯班逊有限公司 | Output switching circuit |
| US9502979B2 (en) | 2010-08-31 | 2016-11-22 | Cypress Semiconductor Corporation | Output switching circuit |
| CN102709880A (en) * | 2012-06-07 | 2012-10-03 | 无锡市晶源微电子有限公司 | Module with optocoupler protection function |
| CN102709880B (en) * | 2012-06-07 | 2015-03-11 | 无锡市晶源微电子有限公司 | Module with optocoupler protection function |
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