CN217388527U - Preceding stage power supply circuit based on peak voltage - Google Patents
Preceding stage power supply circuit based on peak voltage Download PDFInfo
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- CN217388527U CN217388527U CN202221366857.1U CN202221366857U CN217388527U CN 217388527 U CN217388527 U CN 217388527U CN 202221366857 U CN202221366857 U CN 202221366857U CN 217388527 U CN217388527 U CN 217388527U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a preceding stage power supply circuit based on peak voltage, which comprises a peak voltage rectification filter circuit, a power circuit and a control switch; the output end of the peak voltage rectifying and filtering circuit and the output end of the power supply circuit are respectively connected with one end of a control switch, and the other end of the control switch is connected with the power supply end of the preceding stage circuit; and the peak voltage rectifying and filtering circuit is used for rectifying and filtering the peak voltage generated by the preceding stage circuit and then supplying power to the preceding stage circuit through the control switch. According to the method, a peak absorption clamping component is omitted, namely, no heating device is arranged, and the circuit loss is reduced; meanwhile, the peak voltage rectifying and filtering circuit is used for rectifying and filtering the peak voltage generated by the switch tube of the preceding stage circuit, and the control switch is used for supplying power to the preceding stage circuit, so that the working efficiency of the whole machine is improved.
Description
Technical Field
The utility model relates to a remove energy storage power field, concretely relates to preceding stage power supply circuit based on peak voltage.
Background
The driving of a preceding stage PWM signal chip of the mobile energy storage power supply needs a stable 12V-15V power supply. The preceding stage PWM signal chip is generally directly powered by a battery, the voltage variation range of the battery voltage is large at different electric quantities and different powers, and if the battery is directly powered, the preceding stage PWM signal chip may cause unstable operation or damage to the power MOS transistor. The like products on the market generally boost and regulate the voltage of a battery through a boost chip and then supply power to a front stage, and the boost chip provides stable voltage. When the power MOS tube is used, the power MOS tube can generate a pulse voltage which is more than 2 times of the battery voltage after the front-stage circuit works, and the pulse voltage is generally clamped by a push-pull circuit to consume and absorb the voltage so as not to influence the circuit.
As shown in fig. 2 or 3, resistors, capacitors, etc. (e.g., R1, R2, C1, C2, D1, D2) in the front stage circuit frame are spike absorption clamp devices, and when the power is turned on, the clamp devices are directly connected to the front stage PWM signal chip to supply power, and the current of the front stage PWM signal chip passes through a rectifier D1A and a transformer T1 to supply power to Q1 and Q4, so that the Q1 and Q4 generate spike voltages when they are turned on. In order to avoid the influence of the peak voltage on the Q1 and the Q4, the peak voltage of the peak absorption clamping component is generally adopted for absorption, but the peak absorption clamping component generates heat seriously and has larger loss.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, provide a preceding stage supply circuit based on peak voltage, absorb the clamp components and parts (do not generate heat the device) through the cancellation peak, carry out rectification filtering to the peak voltage that Q1, Q4 on-off state produced and recycle, store the pulse voltage who produces behind the preceding stage work and be used for the preceding stage power supply to the energy saving with improve work efficiency.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a pre-stage power supply circuit based on peak voltage comprises a peak voltage rectification filter circuit, a power circuit and a control switch;
the output end of the peak voltage rectifying and filtering circuit and the output end of the power supply circuit are respectively connected with one end of a control switch, and the other end of the control switch is connected with the power supply end of the preceding stage circuit;
and the peak voltage rectifying and filtering circuit is used for rectifying and filtering the peak voltage generated by the preceding stage circuit and then supplying power to the preceding stage circuit through the control switch.
Preferably, the control switch is a P-channel field effect transistor.
Preferably, the power supply circuit further comprises a preceding stage power supply voltage stabilizing circuit, which is used for rectifying and stabilizing the input voltage;
the other end of the control switch is connected with the input end of the preceding stage power supply and voltage stabilizing circuit, and the output end of the preceding stage power supply and voltage stabilizing circuit is connected with the power supply end of the preceding stage circuit.
Preferably, the specific circuit of the power supply circuit includes:
the power supply input end is respectively connected with one end of a switch K1 and one end of a third capacitor C3, the other end of a switch K1 is respectively connected with one end of a first resistor R1 and the positive electrode of a first diode D1, the other end of the first resistor R1 is connected with the base electrode of a triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is respectively connected with one end of a second resistor R2 and the gate of a control switch Q4; the cathode of the first diode D1 and the other end of the second resistor R2 are connected in parallel and then connected with the source of the control switch Q4, and the drain of the control switch Q4 is connected with the input end of the previous stage power supply voltage stabilizing circuit.
Preferably, the specific circuit of the spike voltage rectifying and filtering circuit includes:
a first output end of the front-stage circuit is connected with the anode of a third diode D3, and the cathode of the third diode D3 is connected with one end of a second inductor L2;
a second output end of the preceding stage circuit is connected with the anode of a second diode D2, and the cathode of a second diode D2 is connected with one end of a first inductor L1;
the other end of the first inductor L1, the other end of the second inductor L2 and one end of the first capacitor C1 are connected in parallel and then connected with the source electrode of the control switch Q4; the other terminal of the first capacitor C1 is connected to ground.
Preferably, the transistor Q3 is an NPN transistor.
Compared with the prior art, the beneficial effects of the utility model are that:
according to the method, a peak absorption clamping component is omitted, namely, no heating device is arranged, and the circuit loss is reduced; meanwhile, the peak voltage rectifying and filtering circuit 2 is used for rectifying and filtering the peak voltages generated by the switching tubes Q1 and Q2, and the switch Q4 is controlled to supply power to a preceding-stage circuit, so that the working efficiency of the whole machine is improved.
Description of the drawings:
fig. 1 is a schematic circuit block diagram of a pre-stage power supply circuit based on spike voltage according to an exemplary embodiment of the present invention;
FIG. 2 is a first schematic circuit diagram of the background art of the present invention;
FIG. 3 is a second schematic circuit diagram of the background art of the present invention;
fig. 4 is a specific circuit schematic diagram of a preceding stage power supply circuit based on spike voltage according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
As shown in fig. 1 and 4, the utility model provides a preceding stage power supply circuit based on peak voltage can be used to portable power source, including preceding stage circuit 1, peak voltage rectification filter circuit 2, power supply circuit 3, control switch 4 and preceding stage power supply voltage stabilizing circuit 5.
In this embodiment, the output end of the preceding stage circuit 1 is connected to the input end of the spike voltage rectifying and filtering circuit 2, the output end of the spike voltage rectifying and filtering circuit 2 and the output end of the power supply circuit 3 are respectively connected to one end of the control switch 4, the other end of the control switch 4 is connected to the input end of the preceding stage power supply voltage stabilizing circuit 5, and the output end of the preceding stage power supply voltage stabilizing circuit 5 is connected to the power supply end of the preceding stage circuit 1.
In this embodiment, as shown in fig. 2 and 3, the front-stage circuit mainly includes a PWM signal chip, a rectifier D1A, a transformer T1, a switching tube Q1, a switching tube Q4, and the like, which belong to the existing circuit; the current sent by the PWM signal chip passes through the rectifier D1A and the transformer T1 and then drives the switching tubes Q1 and Q4 to work, so that spike voltage is generated.
In this embodiment, the peak voltage rectifying and filtering circuit is configured to rectify and filter a peak voltage generated by the previous stage circuit, and then use the peak voltage as an input voltage of the previous stage power supply voltage stabilizing circuit 5 through the control switch 4 to supply power to the previous stage circuit.
And the power supply circuit 3 is used for providing starting voltage and cut-off voltage for the front-stage circuit through the control switch 4 and the front-stage power supply voltage stabilizing circuit 5.
The switch 4 is controlled by a P-channel field effect transistor Q4.
The preceding stage power supply voltage stabilizing circuit 5 is used for rectifying and stabilizing the input voltage, and is an existing voltage stabilizing circuit, so that further description is omitted.
Fig. 4 is a specific circuit diagram of a pre-stage power supply circuit based on spike voltage.
In this embodiment, the specific circuit of the power supply circuit 3 includes:
a power supply input end VIN is respectively connected with a 1 end of a switch K1, one end of a third capacitor C3 and the middle end of the output end of a transformer T1 in a preceding stage circuit, a 2 end of the switch K1 is respectively connected with one end of a first resistor R1 and the positive electrode of a first diode D1, the other end of the first resistor R1 is connected with the base of a triode Q3(NPN type), the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is respectively connected with one end of a second resistor R2 and the gate of a control switch Q4 (P-channel field effect transistor); the cathode of the first diode D1 and the other end of the second resistor R2 are connected in parallel and then connected to the source(s) of the control switch Q4, and the drain of the control switch Q4 is connected to the input end of the previous stage power supply voltage stabilizing circuit 5.
The working principle of the power supply circuit 3 is as follows: after the power switch K1 is turned on, the power voltage is applied to the source of the P-channel fet Q4 through the diode D1 on one path, and is applied to the base of the NPN transistor Q3 through the resistor R1 on the other path, and the transistor Q3 is turned on and the fet Q4 is turned on through the resistor R3, so that the power voltage is stabilized by the pre-stage power supply voltage stabilizing circuit 5 and then supplies power to the pre-stage circuit 1.
After the power is supplied to the front-stage circuit 1, the first field effect transistor Q1 (N-channel field effect transistor) and the second field effect transistor Q2 (N-channel field effect transistor) are driven to start working, so as to generate a large peak voltage (equivalent to a power supply voltage more than 2 times), therefore, in this embodiment, the peak voltage rectifying and filtering circuit 2 is adopted to rectify and filter the peak voltage as the input voltage of the front-stage power supply voltage stabilizing circuit 5, so as to supply power to the front-stage circuit 1.
The specific circuit of the spike voltage rectifying and filtering circuit 2 comprises:
a first output end (a drain electrode of the first field effect transistor Q1) of the front-stage circuit is connected with an anode of a third diode D3, and a cathode of the third diode D3 is connected with one end of a second inductor L2; a second output end (a drain electrode of the second field effect transistor Q2) of the front-stage circuit is connected with the anode of a second diode D2, and the cathode of the second diode D2 is connected with one end of a first inductor L1; the other end of the first inductor L1, the other end of the second inductor L2 and one end of the first capacitor C1 are connected in parallel and then connected with the source electrode of the control switch Q4; the other end of the first capacitor C1 is grounded; the source electrode(s) of the first field effect transistor Q1 and the source electrode(s) of the second field effect transistor Q2 are grounded after being connected in parallel; the gate of the first fet Q1 is connected to other devices, and the gate of the second fet Q2 is also connected to other devices, which are connections of devices in the prior art of the prior art, and are not technical points of the present invention, and therefore, the description thereof is omitted.
The operating principle of the peak voltage rectifying and filtering circuit 2 is as follows: when the Q1 and the Q2 of the front-stage circuit 1 start to work, a peak voltage which is more than 2 times is generated, the peak voltage is rectified and filtered through D2, L1, D3, L2 and C1 and then is added to the source of Q4, and Q4 is conducted, so that the peak voltage is input to the front-stage power supply voltage stabilizing circuit 5 and supplies power to the front-stage circuit 1 after being stabilized; at this time, the voltage of the cathode of the diode D1 is higher than the positive voltage, and no current flows when the diode D1 is cut off, that is, the peak voltage generated when the Q1 and Q2 work is completely consumed by the front-stage power supply voltage stabilizing circuit 5, so that the peak voltage generated by the Q1 and Q2 is utilized, and meanwhile, components of a peak absorption circuit are omitted, so that the components are not required to generate heat, the cost is reduced, and the working efficiency of the whole machine is improved.
In this embodiment, the circuit principle is as follows:
when the computer is started: k1 is closed, Q3 and Q4 are conducted, power supply voltage is stabilized by the front-stage power supply voltage stabilizing circuit 5 and then supplies power to the front-stage circuit 1, and Q1 and Q2 in the front-stage circuit 1 start to work; q1, Q2 work to produce the peak voltage, through the rectification of the rectification filter circuit 2 of the peak voltage, supply power for the preceding stage circuit 1 through control switch Q4 and preceding stage power supply voltage regulator circuit 5; at this time, the cathode voltage of the diode D1 is higher than the positive voltage, and no power current flows when the diode D1 is turned off, that is, the front-stage power supply voltage stabilizing circuit 5 consumes the peak voltage generated when the Q1 and the Q2 operate;
when the device is shut down: when the voltage K1 is off and no current flows to the Q3, the Q4 is turned off, and the voltage of the spike voltage rectifying and filtering circuit 2 and the power supply voltage of the power supply circuit 3 can not supply power to the front-stage circuit 1 through the Q4 and the front-stage power supply voltage stabilizing circuit 5, so that the circuit does not work.
The above description is only for the purpose of illustrating the embodiments of the present invention, and not for the purpose of limiting the same. Various substitutions, modifications and improvements may be made by those skilled in the relevant art without departing from the spirit and scope of the invention.
Claims (6)
1. A pre-stage power supply circuit based on peak voltage is characterized by comprising a peak voltage rectification filter circuit, a power circuit and a control switch;
the output end of the peak voltage rectifying and filtering circuit and the output end of the power supply circuit are respectively connected with one end of a control switch, and the other end of the control switch is connected with the power supply end of the preceding stage circuit;
and the peak voltage rectifying and filtering circuit is used for rectifying and filtering the peak voltage generated by the preceding stage circuit and then supplying power to the preceding stage circuit through the control switch.
2. The peak-voltage-based pre-stage power supply circuit as claimed in claim 1, wherein the control switch is a P-channel fet.
3. The spike voltage based pre-stage power supply circuit of claim 1, further comprising a pre-stage power supply voltage stabilizing circuit for rectifying and stabilizing an input voltage;
the other end of the control switch is connected with the input end of the preceding-stage power supply and voltage stabilizing circuit, and the output end of the preceding-stage power supply and voltage stabilizing circuit is connected with the power supply end of the preceding-stage circuit.
4. The spike voltage based pre-stage power supply circuit as claimed in claim 3, wherein the specific circuit of the power supply circuit comprises:
the power supply input end is respectively connected with one end of a switch (K1) and one end of a third capacitor (C3), the other end of a switch (K1) is respectively connected with one end of a first resistor (R1) and the anode of a first diode (D1), the other end of the first resistor (R1) is connected with the base of a triode (Q3), the emitter of the triode (Q3) is grounded, the collector of the triode (Q3) is connected with one end of a third resistor (R3), and the other end of the third resistor (R3) is respectively connected with one end of a second resistor (R2) and the gate of a control switch (Q4); the negative electrode of the first diode (D1) and the other end of the second resistor (R2) are connected in parallel and then connected with the source electrode of the control switch (Q4), and the drain electrode of the control switch (Q4) is connected with the input end of the previous stage power supply voltage stabilizing circuit.
5. The spike voltage based pre-stage power supply circuit as claimed in claim 3, wherein the spike voltage rectifying and filtering circuit comprises:
the first output end of the preceding stage circuit is connected with the anode of a third diode (D3), and the cathode of the third diode (D3) is connected with one end of a second inductor (L2);
a second output end of the front-stage circuit is connected with the anode of a second diode (D2), and the cathode of the second diode (D2) is connected with one end of a first inductor (L1);
the other end of the first inductor (L1), the other end of the second inductor (L2) and one end of the first capacitor (C1) are connected in parallel and then connected with the source electrode of the control switch (Q4); the other end of the first capacitor (C1) is grounded.
6. The peak-voltage-based foreline power supply circuit according to claim 4, wherein said transistor (Q3) is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221366857.1U CN217388527U (en) | 2022-06-01 | 2022-06-01 | Preceding stage power supply circuit based on peak voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221366857.1U CN217388527U (en) | 2022-06-01 | 2022-06-01 | Preceding stage power supply circuit based on peak voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217388527U true CN217388527U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221366857.1U Active CN217388527U (en) | 2022-06-01 | 2022-06-01 | Preceding stage power supply circuit based on peak voltage |
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| Country | Link |
|---|---|
| CN (1) | CN217388527U (en) |
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2022
- 2022-06-01 CN CN202221366857.1U patent/CN217388527U/en active Active
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