CN203339960U

CN203339960U - Boost circuit

Info

Publication number: CN203339960U
Application number: CN2013204613443U
Authority: CN
Inventors: 黎旭峰
Original assignee: SHENZHEN GTB TECHNOLOGY Co Ltd
Current assignee: SHENZHEN GTB TECHNOLOGY Co Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2013-12-11
Anticipated expiration: 2023-07-30

Abstract

The utility model discloses a boost circuit. The boost circuit comprises an energy storage circuit, a control circuit, and a load circuit and a first switching circuit which are connected with the energy storage circuit separately. The first switching circuit is used to control the energy storage of the energy storage circuit through switch-on and switch-off operations or delivery energy to the load circuit. The switch-on and switch-off of the first switching circuit are controlled by the control circuit connected with the same. The boost circuit further comprises a feedback circuit connected with the load circuit and the control circuit separately. The feedback circuit is used to detect the voltage value of the load circuit and delivery the detection result to the control circuit. The control circuit is used to send a signal to the first switching circuit according to the detection result. The feedback circuit comprises a second switching circuit, wherein the second switching circuit is used to control the on/off of the feedback circuit. When the boost circuit of the utility model is off working state, the feedback circuit will be switched to the off state automatically, so no power consumption will be generated by components in the feedback circuit, and the self-loss rate and the calorific value of the present circuit after shutdown are greatly reduced.

Description

A kind of BOOST booster circuit

Technical field

The utility model relates to power supply, relates in particular to a kind of BOOST booster circuit.

Background technology

The BOOST booster circuit, for lower direct voltage is drawn high, the voltage of output and power consumption equipment coupling.In the prior art, as shown in Figure 1, typical BOOST booster circuit is as follows: the inductance L, diode VD and the capacitor C out that comprise series connection in order between input anode Vin+ and input negative terminal Vin-, wherein, one end of inductance L is connected with input anode Vin+, the anodic bonding of the other end of inductance L and diode VD, the end of the negative electrode of diode VD and capacitor C out is connected, the other end of capacitor C out is connected with input negative terminal Vin-, the two ends of capacitor C out are the positive and negative end of output (Vout+, Vout-), provide burning voltage for power consumption equipment, also comprise the switching tube Q be connected between diode VD anode and input negative terminal Vin-, be connected to the feedback circuit formed by resistance (R1, R2) between diode VD negative electrode and input negative terminal Vin-, and the control circuit be connected with switching tube Q, feedback circuit respectively, feedback circuit detects the magnitude of voltage of output, and detection information is fed back to control circuit, control circuit is regulated control signal (pwm signal or PFM signal) according to the detection information received, time scale or inversion frequency with the conduction and cut-off of by-pass cock pipe Q, time scale or the inversion frequency between the accumulation of energy of change inductance L and afterflow, switched, during switching tube Q conducting, the diode reverse cut-off, DC power supply, inductance L and switching tube Q form a closed-loop path, inductance L is in this stage energy storage, during switching tube Q cut-off, the conducting of diode VD forward bias, DC power supply, inductance L, diode VD, capacitor C out forms a closed-loop path, the energy of the power of this stage DC power supply and inductance L storage flows to capacitor C out by diode VD simultaneously, in theory, the time scale of the conduction and cut-off by by-pass cock pipe Q or the mode of inversion frequency can rise to input voltage value any voltage value output.

According to foregoing circuit, when control circuit quits work, switching tube Q is in off-state, the annexation of circuit is, from input anode Vin+, inductance L, diode VD, capacitor C out and input negative terminal Vin-form a loop, feedback circuit and capacitor C out parallel connection, high resistant state property due to capacitor C out under direct current, the voltage at capacitor C out two ends equals in fact input terminal voltage, due to feedback circuit and capacitor C out parallel connection, therefore the pressure drop at feedback circuit two ends is identical with the pressure drop at capacitor C out two ends, therefore feedback circuit still can produce power consumption when control circuit quits work, increased circuit from the proportion of goods damageds and caloric value.

The utility model content

The utility model provides the BOOST booster circuit, is intended to solve the BOOST circuit and still produces power consumption under off-mode, causes the high and large problem of caloric value from the proportion of goods damageds of circuit.

For addressing the above problem, the utility model by the following technical solutions:

A kind of BOOST booster circuit comprises: accumulator and control circuit; The load circuit be connected with this accumulator respectively and the first switching circuit, described the first switching circuit is by the described accumulator energy storage of state switching controls between its conducting and cut-off or to described load circuit transferring energy; The conducting of described the first switching circuit and cut-off are controlled by the control circuit be attached thereto; Also comprise the feedback circuit be connected with described load circuit, control circuit respectively, this feedback circuit detects the magnitude of voltage of described load circuit and testing result is passed to described control circuit, described control circuit sends signal according to described testing result to described the first switching circuit, with conducting and the cut-off of adjusting described the first switching circuit; Wherein, feedback circuit comprises the second switch circuit, and this second switch circuit is used for the path of feedback control circuit and opens circuit, and described second switch circuit is connected with described control circuit or described the first switching circuit.

Implement the utility model, the beneficial effect produced is as follows:

This circuit makes improvements the feedback circuit in the BOOST booster circuit of prior art, added the second switch circuit, when the BOOST booster circuit is in running order, the second switch circuit turn-on, feedback circuit is in channel status, at the BOOST booster circuit during in non operating state, the cut-off of second switch circuit, feedback circuit is in off state.As mentioned above, at the BOOST booster circuit, in non operating state (being that control circuit quits work), feedback circuit opens circuit, so the components and parts on feedback circuit can not produce power consumption, greatly reduces this circuit postboost from the proportion of goods damageds and caloric value.

The accompanying drawing explanation

Fig. 1 is a typical illustration of the BOOST booster circuit of prior art;

Fig. 2 is that the utility model is realized schematic diagram in a preferred embodiment;

Fig. 3 is the circuit connection diagram of the utility model in a preferred embodiment;

Fig. 4 is that the utility model is realized schematic diagram in another preferred embodiment.

Embodiment

In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

Embodiment 1

As shown in Figure 2,3, a kind of BOOST booster circuit, comprise accumulator 11, the energy that the storage DC power supply provides, load circuit 12, be connected with accumulator 11, the first switching circuit 13, be connected with accumulator 11, controls accumulator 11 stored energys or to load circuit 12 transferring energies, control circuit 14, with the first switching circuit 12, be connected, send PWM or PFM signal to the first switching circuit 12, control the first switching circuit 13 in the ratio of setting (in one-period, the time ratio of the first switching circuit 12 conductings and cut-off) or conducting and the cut-off of frequency period, control accumulator 11 for stored energy with for the ratio of the time between the two states to load circuit 12 transferring energies with this, take pwm signal as example, control circuit 14 is recently regulated the time ratio of the conduction and cut-off of the first switching circuit 13 in one-period by the duty of regulating PWM, when the first switching circuit 13 conducting, energy storage circuit 11 stored energys, when the first switching circuit 13 cut-off, flow to load circuit 12 together with the energy of the power of external dc power and energy storage circuit 11 storages, the gain that circuit obtains accordingly

(M is circuit gain, and output voltage is than the increment of input voltage, the duty ratio that D is the first switching circuit 11),

After being raised to setting voltage value, exports input voltage, one feedback circuit 15 magnitude of voltage of monitoring output in real time need to be set, this feedback circuit 5 is connected with load circuit 12, control circuit 14 respectively, feedback circuit 15 is for detection of the magnitude of voltage (being output voltage) of load circuit 12 and detected value is fed back to control circuit 14, control circuit 14 is regulated PWM or PFM signal according to detected value, arrive the purpose of regulating circuit gain M, make output voltage reach set point; Under the out-of-work state of control circuit 14, for making the components and parts on feedback circuit 15 not produce power consumption, be provided with second switch circuit 15a in feedback circuit 15, the control end of this second switch circuit 15a is connected to an end of the first switching circuit 13, on the tie point of the first switching circuit 13 and accumulator 11, control the conduction and cut-off of second switch circuit 15a by the conduction and cut-off state of the first switching circuit 13, when control circuit 14 is not worked, the first switching circuit 13, always in off-state, makes feedback circuit 15 in off state.

During concrete enforcement:

Load circuit 12 comprises the first diode VD1 and output capacitance CCout, the anode of the first diode VD1 is connected with accumulator 11, the end of the negative electrode of the first diode VD1 and output capacitance CCout is connected, the negative terminal Vout-of another termination output voltage of output capacitance CCout.

Feedback circuit 15 comprises second switch circuit 15a and a plurality of resistance, and described second switch circuit comprises the second diode VD2, capacitor C and switching tube Q2; A plurality of resistance and switching tube Q2 series connection, the series circuit one of formation terminates on the tie point of the first diode VD1 and output capacitance CCout, the negative terminal Vout-of another termination output voltage; Wherein, the control end of switching tube Q2 is connected on the tie point of accumulator 11 and the first switching circuit 13, and the dividing point between resistance is connected with control circuit 14.

Further, switching tube Q1 is preferably PNP triode or PMOS pipe.

The first switching circuit 13 can adopt metal-oxide-semiconductor or IGBT pipe, certainly, also can adopt other power tubes.

For convenience of explanation, below enumerate a physical circuit connection layout and be illustrated, should be appreciated that this physical circuit connection layout is not limited to the utility model.

As shown in Figure 3, the input anode Vin+ of this circuit is connected with input negative terminal Vin-by inductance L L, NMOS pipe Q1, the end of input anode Vin+ and inductance L L is connected, and the other end of inductance L L and NMOS manage the connection of missing of Q1, and the source electrode of NMOS pipe Q1 connects input negative terminal Vin-, the tie point of inductance L L and NMOS pipe Q1 and the anodic bonding of the first diode VD1, the anode of the first diode VD1 meets output negative terminal Vout-by output capacitance CCout, feedback circuit 15 comprises by PNP triode Q2, the second switch circuit that the second diode VD2 and capacitor C form, and resistance R 3, R4, the emitter of PNP triode Q2 is connected on the tie point of the first diode VD1 and output capacitance CCout, the collector electrode of PNP triode Q2 meets output negative terminal Vout-after series resistance R3 and resistance R 4 successively, the base stage of PNP triode Q2 connects respectively the anode of the second diode VD2 and an end of capacitor C, the negative electrode of the second diode VD2 is connected on the tie point of inductance L L and NMOS pipe Q1, another termination output negative terminal Vout-of capacitor C, the tie point of resistance R 3 and resistance R 4 is connected with control circuit 14, control circuit 14 also is connected with the grid of NMOS pipe Q1.When control circuit 14 work, the NMOS pipe periodic conducting of Q1 and cut-off, make on capacitor C to produce voltage or the current signal that drives PNP triode Q2 conducting, makes feedback circuit 15 in channel status; When control circuit 14 quits work, NMOS pipe Q1 is always in off-state, make the second diode VD2 continue cut-off, can't produce the signal that drives PNP triode Q2 work on capacitor C, therefore PNP triode Q2 is in cut-off state, and corresponding, feedback circuit 15 is in off state, components and parts on feedback circuit 15 do not produce power consumption, greatly reduce this circuit postboost from the proportion of goods damageds and caloric value.

Embodiment 2

As shown in Figure 4, a kind of BOOST booster circuit, accumulator 11; The load circuit 12 be connected with this accumulator 11 respectively and the first switching circuit 13, the first switching circuits 13 are by state switching controls accumulator 11 energy storage between its conducting and cut-off or to load circuit 12 transferring energies; The conducting of the first switching circuit 13 and cut-off are controlled by the control circuit 14 be attached thereto; Also comprise the feedback circuit 15 be connected with load circuit 11, control circuit 14 respectively, this feedback circuit 15 detects the magnitude of voltage of load circuit 12 and testing result is passed to control circuit 14, control circuit 14 sends signal according to described testing result to the first switching circuit, with the state switching between the conducting of adjusting the first switching circuit 13 and cut-off, as duty ratio or switching frequency; Wherein, feedback circuit 15 comprises second switch circuit 15a, this second switch circuit 15a is used for the path of feedback control circuit 15 and opens circuit, second switch circuit 15 is connected with control circuit 14, control circuit 14 is by the conducting of second switch circuit 15a and path and the off state of cut-off feedback control circuit 15, same beneficial effect in 1 in the time of can reaching and implement equally, selecting of components and parts can, with reference to embodiment 1, do not done further and repeat at this.

Above-described the utility model execution mode, do not form the restriction to the utility model protection range.Any modification of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.

Claims

1. a BOOST booster circuit, is characterized in that, comprising: accumulator and control circuit; The load circuit be connected with this accumulator respectively and the first switching circuit, described the first switching circuit is by the described accumulator energy storage of state switching controls between its conducting and cut-off or to described load circuit transferring energy; The conducting of described the first switching circuit and cut-off are controlled by the control circuit be attached thereto; Also comprise the feedback circuit be connected with described load circuit, control circuit respectively, this feedback circuit detects the magnitude of voltage of described load circuit and testing result is passed to described control circuit, described control circuit sends signal according to described testing result to described the first switching circuit, with conducting and the cut-off of adjusting described the first switching circuit; Wherein, feedback circuit comprises the second switch circuit, the path of this second switch circuit feedback control circuit and opening circuit, and described second switch circuit is connected with described control circuit or described the first switching circuit.

2. BOOST booster circuit according to claim 1, it is characterized in that, described load circuit comprises the first diode and output capacitance, the anode of described the first diode is connected with described accumulator, one end of the negative electrode of described the first diode and described output capacitance is connected, another termination output negative terminal of described output capacitance.

3. BOOST booster circuit according to claim 2, is characterized in that, described feedback circuit also comprises a plurality of resistance, and described second switch circuit comprises the second diode, electric capacity and switching tube;

Described a plurality of resistance and the series connection of described switching tube, the series circuit one of formation terminates on the tie point of described the first diode and output capacitance, another termination output negative terminal; Wherein, the control end of described switching tube connects respectively the anode of described the second diode and an end of described electric capacity, the negative electrode of described the second diode is connected on the tie point of described accumulator and the first switching circuit, another termination output negative terminal of described capacitor discharge, the dividing point between described resistance is connected with described control circuit.

4. BOOST booster circuit according to claim 3, is characterized in that, described switching tube comprises PNP triode or PMOS pipe.

5. according to the described BOOST booster circuit of claim 1 to 4 any one, it is characterized in that, described the first switching circuit is metal-oxide-semiconductor or IGBT pipe.