CN201910653U - Charging circuit of RCC (ringing choke converter) switching power supply - Google Patents
Charging circuit of RCC (ringing choke converter) switching power supply Download PDFInfo
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Abstract
本实用新型涉及RCC开关电源，尤涉及一种低空载功耗的RCC开关电源充电电路。本实用新型的技术方案是：将RCC开关电源初级的开关控制单元的稳压二极管的负极接于其开关管集电极稳流单元的稳流三极管Q2的发射极，并在该稳流三极管Q2的发射极和地之间接一二极管D2，将RCC开关电源次级的稳压滤波单元和电压取样单元之间接一由电容C6和电阻R10组成的正反馈振荡电路。本实用新型具有的有益效果是：1.减少了初级电路的静态工作电流，降低了电路的空载功耗；2.该电路对开关管基极的电压嵌位稳压二极管D3的一致性要求下降，方便了器件的采购；3.次级充电控制部分用于控制充电电流的三极管工作在饱和状态，器件更具有可靠性。
The utility model relates to an RCC switching power supply, in particular to an RCC switching power supply charging circuit with low no-load power consumption. The technical scheme of the utility model is: connect the negative pole of the voltage stabilizing diode of the primary switching control unit of the RCC switching power supply to the emitter of the stabilizing transistor Q2 of the switching tube collector stabilizing unit, and in this stabilizing triode Q2 A diode D2 is connected between the emitter and the ground, and a positive feedback oscillation circuit composed of a capacitor C6 and a resistor R10 is connected between the voltage stabilization filter unit and the voltage sampling unit of the RCC switching power supply secondary. The utility model has the beneficial effects as follows: 1. The static working current of the primary circuit is reduced, and the no-load power consumption of the circuit is reduced; 2. The circuit has the consistency requirement for the voltage clamping regulator diode D3 of the switch tube base 3. The triode used to control the charging current in the secondary charging control part works in a saturated state, and the device is more reliable.
Description
技术领域technical field
本实用新型涉及RCC开关电源，尤涉及一种低空载功耗的RCC开关电源充电电路。The utility model relates to an RCC switching power supply, in particular to an RCC switching power supply charging circuit with low no-load power consumption.
背景技术Background technique
RCC式开关电源，即反激式自激变换器，以其电路简单，成本低廉，在小功率的电源场合尚具有广阔的应用空间，而目前RCC开关电源的空载功耗普遍在0.9W左右，即使同样设计也会因器件误差导致有较多产品的空载功耗超出节能环保标准要求的1W，使得次品率较高。RCC switching power supply, that is, flyback self-excited converter, has a wide application space in low-power power supply occasions due to its simple circuit and low cost. At present, the no-load power consumption of RCC switching power supply is generally around 0.9W. , Even with the same design, due to device errors, the no-load power consumption of many products exceeds the 1W required by energy-saving and environmental protection standards, resulting in a high defective rate.
且现有RCC开关电源充电电路的次级充电控制部分用于控制充电电流的三极管工作在放大状态，而非饱和状态，在功率过大是容易烧毁。And the triode used to control the charging current in the secondary charging control part of the existing RCC switching power supply charging circuit works in an amplified state, not a saturated state, and is easy to burn out when the power is too large.
实用新型内容Utility model content
针对现有技术方案的不足，本实用新型提出一种低空载功耗的RCC开关电源充电电路，其空载功耗在0.7W左右，且其次级充电控制部分用于控制充电电流的三极管工作在饱和状态，器件更具有可靠性。Aiming at the deficiencies of the existing technical solutions, the utility model proposes a low no-load power consumption RCC switching power supply charging circuit, its no-load power consumption is about 0.7W, and its secondary charging control part is used to control the triode operation of the charging current In saturation, the device is more reliable.
本实用新型采用的技术方案如下：The technical scheme that the utility model adopts is as follows:
一种低空载功耗的RCC开关电源充电电路，其跟目前的常见设计相同之处为：由二极管D1和电解电容C1构成的整流滤波单元，由一次绕组、二次绕组和辅助电源绕组构成的高频变压器，该变压器的一次绕组、开关三极管Q1、电阻R4串联后接所述整流滤波单元的两个输出端，该变压器的辅助绕组的A端通过电容C3、电阻R2接所述开关三极管Q1的基极，B端接地，启动电阻R1的两端分别接整流滤波单元的正电源端和开关三极管Q1的基极，由二极管D4、电解电容C2和稳压二极管D3构成的开关控制单元，所述二极管D4的正极、稳压二极管D3的正极、电解电容C2的负极相互并联，电解电容C2的正极接地，二极管D4的负极接所述变压器辅助绕组的A端，由三极管Q2和电阻R3构成的开关管集电极稳流单元，该三极管Q2的集电极接所述开关三极管Q1的基极，基极通过电阻R3接所述开关三极管Q1的发射极，此RCC开关电源充电电路还包括：由二极管D6和滤波电容C5构成的次级整流滤波单元以及次级充电控制单元，该次级充电控制单元由三极管Q3、Q4、电阻R8、发光二极管D9、电阻R7-R9、R11、R12、三端基准电压源器件IC1和电解电容C7组成的，其中，三极管Q4的发射极和电阻R8的一端接所述整流滤波单元的电源正端，电阻R8的另一端，三极管Q4的集电极、二极管D7的正极以及电阻R9的一端相互并联，电阻R9的另一端接三极管Q3的基极，三极管Q3的集电极接于三极管Q4的基极，三极管Q3的发射极通过发光二极管D9和电阻R7接地，三端基准电压源器件IC1的正负两级跟电解电容C7并联接于三极管Q3的基极和地，电阻R11一端接二极管D7的负极，另一端和三端基准电压源器件IC1的控制端、电阻R12的一端并联，电阻R12的另一端接地，其设计的独有之处在于：A low no-load power consumption RCC switching power supply charging circuit, which is the same as the current common design: a rectifying and filtering unit composed of a diode D1 and an electrolytic capacitor C1, composed of a primary winding, a secondary winding and an auxiliary power supply winding A high-frequency transformer, the primary winding of the transformer, the switching transistor Q1, and the resistor R4 are connected in series to the two output terminals of the rectification and filtering unit, and the A terminal of the auxiliary winding of the transformer is connected to the switching transistor through a capacitor C3 and a resistor R2 The base of Q1, the B terminal is grounded, the two ends of the starting resistor R1 are respectively connected to the positive power supply terminal of the rectifier filter unit and the base of the switching transistor Q1, and the switching control unit composed of diode D4, electrolytic capacitor C2 and Zener diode D3, The positive pole of the diode D4, the positive pole of the Zener diode D3, and the negative pole of the electrolytic capacitor C2 are connected in parallel, the positive pole of the electrolytic capacitor C2 is grounded, and the negative pole of the diode D4 is connected to the A terminal of the auxiliary winding of the transformer, which is composed of a triode Q2 and a resistor R3 A switching tube collector current stabilizing unit, the collector of the transistor Q2 is connected to the base of the switching transistor Q1, and the base is connected to the emitter of the switching transistor Q1 through a resistor R3. The RCC switching power supply charging circuit also includes: The secondary rectification filter unit and secondary charging control unit composed of diode D6 and filter capacitor C5, the secondary charging control unit consists of transistors Q3, Q4, resistor R8, light emitting diode D9, resistors R7-R9, R11, R12, three terminals The reference voltage source device IC1 and the electrolytic capacitor C7 are composed, wherein, the emitter of the triode Q4 and one end of the resistor R8 are connected to the positive end of the power supply of the rectification and filtering unit, the other end of the resistor R8, the collector of the triode Q4, and the terminal of the diode D7 The positive electrode and one end of the resistor R9 are connected in parallel, the other end of the resistor R9 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the base of the transistor Q4, the emitter of the transistor Q3 is grounded through the light-emitting diode D9 and the resistor R7, and the three terminals The positive and negative stages of the reference voltage source device IC1 and the electrolytic capacitor C7 are connected in parallel to the base of the transistor Q3 and the ground, one end of the resistor R11 is connected to the negative electrode of the diode D7, the other end is connected to the control terminal of the three-terminal reference voltage source device IC1, and the resistor R12 One end of the resistor R12 is connected in parallel, and the other end of the resistor R12 is grounded. The uniqueness of its design lies in:
所述开关管集电极稳流单元还包括一个二极管D2，该二极管D2的正极接所述三极管Q2的发射极，二极管D2的负极接地，所述开关控制单元的稳压二极管D3的负极接于所述二极管Q2的正极。The collector current stabilizing unit of the switching tube also includes a diode D2, the anode of the diode D2 is connected to the emitter of the triode Q2, the cathode of the diode D2 is grounded, and the cathode of the voltage stabilizing diode D3 of the switching control unit is connected to the transistor Q2. The anode of the diode Q2.
进一步的，所述次级充电控制单元还包括：由电容C6和电阻R10组成的正反馈振荡电路，该电容C6的一端接所述整流滤波单元的电源正端，另一端通过电阻R10接于取样电阻R11、R12的连接点。Further, the secondary charging control unit also includes: a positive feedback oscillating circuit composed of a capacitor C6 and a resistor R10, one end of the capacitor C6 is connected to the positive end of the power supply of the rectification and filtering unit, and the other end is connected to the sampling The connection point of resistors R11 and R12.
本实用新型通过采用上述技术方案，具有如下有益效果：The utility model has the following beneficial effects by adopting the above-mentioned technical scheme:
1.减少了初级电路的静态工作电流，降低了电路的空载功耗。1. Reduce the quiescent working current of the primary circuit and reduce the no-load power consumption of the circuit.
2.该电路对开关管基极的电压嵌位稳压二极管D3的一致性要求下降，方便了器件的采购。2. The circuit lowers the requirement for the consistency of the voltage clamping Zener diode D3 at the base of the switching tube, which facilitates the procurement of devices.
3.次级充电控制部分用于控制充电电流的三极管工作在饱和状态，器件更具有可靠性。3. The triode used to control the charging current in the secondary charging control part works in a saturated state, and the device is more reliable.
附图说明Description of drawings
图1是本实用新型的电路原理图。Fig. 1 is the schematic circuit diagram of the utility model.
具体实施方式Detailed ways
现结合附图和具体实施方式对本实用新型进一步说明。The utility model is further described now in conjunction with accompanying drawing and specific embodiment.
参阅图1所示，本实施例低空载功耗的RCC开关电源充电电路，分为位于变压器B1两侧绕组的初级侧部分的电路和次级侧部分的电路。Referring to FIG. 1 , the charging circuit of the RCC switching power supply with low no-load power consumption in this embodiment is divided into a circuit on the primary side and a circuit on the secondary side of the windings on both sides of the transformer B1.
初级侧部分电路跟目前的常见设计相同之处为：由二极管D1和电解电容C1构成的整流滤波单元，由一次绕组、二次绕组和辅助电源绕组构成的高频变压器，该变压器的一次绕组、开关三极管Q1、电阻R4串联后接所述整流滤波单元的两个输出端，该变压器的辅助绕组的A端通过电容C3、电阻R2接所述开关三极管Q1的基极，B端接地，启动电阻R1的两端分别接整流滤波单元的正电源端和开关三极管Q1的基极，由二极管D4、电解电容C2和稳压二极管D3构成的开关控制单元，所述二极管D4的正极、稳压二极管D3的正极、电解电容C2的负极相互并联，电解电容C2的正极接地，二极管D4的负极接所述变压器辅助绕组的A端，由三极管Q2和电阻R3构成的开关管集电极稳流单元，该三极管Q2的集电极接所述开关三极管Q1的基极，基极通过电阻R3接所述开关三极管Q1的发射极。二极管D1和电容C1组成半波整流和滤波电路；电阻R1、电阻R2、电阻R4、电容C3、三极管Q1和变压器B1组成常规的开关电源自激振荡电路；二极管D5、电容C4、电阻R5组成削高压电路。The part of the circuit on the primary side is the same as the current common design: a rectifier filter unit composed of a diode D1 and an electrolytic capacitor C1, a high-frequency transformer composed of a primary winding, a secondary winding and an auxiliary power supply winding, the primary winding of the transformer, The switching transistor Q1 and the resistor R4 are connected in series to the two output terminals of the rectifying and filtering unit, the A terminal of the auxiliary winding of the transformer is connected to the base of the switching transistor Q1 through the capacitor C3 and the resistor R2, the B terminal is grounded, and the starting resistor The two ends of R1 are respectively connected to the positive power supply terminal of the rectification filter unit and the base of the switching transistor Q1, and the switching control unit is composed of a diode D4, an electrolytic capacitor C2 and a voltage stabilizing diode D3. The anode of the diode D4, the voltage stabilizing diode D3 The positive pole of the electrolytic capacitor C2 and the negative pole of the electrolytic capacitor C2 are connected in parallel, the positive pole of the electrolytic capacitor C2 is grounded, the negative pole of the diode D4 is connected to the A terminal of the auxiliary winding of the transformer, and the switching tube collector current stabilizing unit composed of the triode Q2 and the resistor R3, the triode The collector of Q2 is connected to the base of the switching transistor Q1, and the base is connected to the emitter of the switching transistor Q1 through a resistor R3. Diode D1 and capacitor C1 form a half-wave rectification and filter circuit; resistor R1, resistor R2, resistor R4, capacitor C3, transistor Q1 and transformer B1 form a conventional switching power supply self-excited oscillation circuit; diode D5, capacitor C4, and resistor R5 form a chipping circuit. high voltage circuit.
其设计的独有之处在于：所述开关管集电极稳流单元还包括一个二极管D2，该二极管D2的正极接所述三极管Q2的发射极，二极管D2的负极接地，所述开关控制单元的稳压二极管D3的负极接于所述二极管Q2的正极。Its design is unique in that: the collector current stabilizing unit of the switch tube also includes a diode D2, the anode of the diode D2 is connected to the emitter of the triode Q2, the cathode of the diode D2 is grounded, and the switch control unit The cathode of the Zener diode D3 is connected to the anode of the diode Q2.
这样可以把电阻R1的值取得更大，以减少电路的静态工作电流，同时该电路对稳压二极管D3的一致性要求下降，方便了器件的采购。当自激振荡电路处于反激状态时，辅助绕组会出现负电压，二极管D4和电容C4组成整流滤波电路，当电压超过二极管D3的稳压值时，二极管D3导通，二极管D3导通又控制三极管Q2导管，关闭三极管Q1工作，二极管D3的导通时间的长短，可以关闭自激振荡电路的工作时间，让自激振荡处于打嗝状态。In this way, the value of the resistor R1 can be made larger to reduce the quiescent operating current of the circuit, and at the same time, the requirement of the circuit for the consistency of the Zener diode D3 is reduced, which facilitates the procurement of components. When the self-excited oscillation circuit is in the flyback state, the auxiliary winding will have a negative voltage, and the diode D4 and the capacitor C4 form a rectification filter circuit. When the voltage exceeds the voltage regulation value of the diode D3, the diode D3 conducts, and the diode D3 conducts and controls Transistor Q2 leads to turn off the operation of triode Q1, and the length of the conduction time of diode D3 can shut down the working time of the self-excited oscillation circuit, so that the self-excited oscillation is in a hiccup state.
初级侧部分电路具体：由二极管D6和滤波电容C5构成的次级整流滤波单元以及次级充电控制单元，该次级充电控制单元由三极管Q3、Q4、电阻R8、发光二极管D9、电阻R7-R9、R11、R12、三端基准电压源器件IC1和电解电容C7组成的，其中，三极管Q4的发射极和电阻R8的一端接所述整流滤波单元的电源正端，电阻R8的另一端，三极管Q4的集电极、二极管D7的正极以及电阻R9的一端相互并联，电阻R9的另一端接三极管Q3的基极，三极管Q3的集电极接于三极管Q4的基极，三极管Q3的发射极通过发光二极管D9和电阻R7接地，三端基准电压源器件IC1的正负两级跟电解电容C7并联接于三极管Q3的基极和地，电阻R11一端接二极管D7的负极，另一端和三端基准电压源器件IC1的控制端、电阻R12的一端并联，电阻R12的另一端接地。二极管D6和电容C5组成低压整流滤波电路；电阻R6发光二极管D8(绿灯)为电源指示灯；三极管Q3、三极管Q4、电阻R8、电阻R9、发光二极管D9和电阻R7组成输出电源开关电路；当开关电路导通时发光二极管D9(红灯)亮(表示在充电中)，当开关电路关闭发光二极管D9(红灯)熄灭(表示充电停止)；二极管D7单向导通，防电池放在充电器中过度放电；三端基准电压源器件IC1、电解电容C7、电阻R11和电阻R12组成充电电压控制电路，当电池电压＝(R11/R12+1)*2.5V，或者是(R11/R12+1)*1.25V时(三端基准电压源器件IC1型号不同计算参数就不同)，控制电路关闭三级管Q3、三级管Q4，充电结束。Part of the circuit on the primary side is specific: a secondary rectification filter unit composed of a diode D6 and a filter capacitor C5, and a secondary charging control unit. The secondary charging control unit is composed of transistors Q3, Q4, resistor R8, light-emitting diode D9, and resistors R7-R9 , R11, R12, a three-terminal reference voltage source device IC1 and an electrolytic capacitor C7, wherein the emitter of the transistor Q4 and one end of the resistor R8 are connected to the positive end of the power supply of the rectifier filter unit, the other end of the resistor R8, and the transistor Q4 The collector of the diode D7 and one end of the resistor R9 are connected in parallel, the other end of the resistor R9 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the base of the transistor Q4, and the emitter of the transistor Q3 passes through the light-emitting diode D9 And resistance R7 is grounded, the positive and negative stages of the three-terminal reference voltage source device IC1 are connected in parallel with the base of the transistor Q3 and the ground with the electrolytic capacitor C7, one end of the resistor R11 is connected to the negative pole of the diode D7, and the other end is connected to the three-terminal reference voltage source device The control terminal of IC1 is connected in parallel with one end of the resistor R12, and the other end of the resistor R12 is grounded. Diode D6 and capacitor C5 form a low-voltage rectification filter circuit; resistor R6, light-emitting diode D8 (green light) is a power indicator light; triode Q3, triode Q4, resistor R8, resistor R9, light-emitting diode D9 and resistor R7 form an output power switch circuit; when the switch When the circuit is turned on, the light-emitting diode D9 (red light) is on (indicating that it is charging), when the switch circuit is closed, the light-emitting diode D9 (red light) is off (indicating that charging is stopped); the diode D7 conducts in one direction, preventing the battery from being placed in the charger Excessive discharge; three-terminal reference voltage source device IC1, electrolytic capacitor C7, resistor R11 and resistor R12 form a charging voltage control circuit, when the battery voltage = (R11/R12+1)*2.5V, or (R11/R12+1) * At 1.25V (calculation parameters are different for different models of the three-terminal reference voltage source device IC1), the control circuit turns off the triode Q3 and triode Q4, and the charging ends.
改进的，所述次级充电控制单元还包括：由电容C6和电阻R10组成的正反馈振荡电路，该电容C6的一端接所述整流滤波单元的电源正端，另一端通过电阻R10接于取样电阻R11、R12的连接点。当电池快充满时，充电电压接近三端基准电压源器件IC1的控制电压时，三端基准电压源器件IC1的受控端逐步导通，流入三极管Q3的基极电流逐渐减小，继而三极管Q4的输出电流减少，随着电池电压的上升，其通过电阻R10对电容C6充电，则三端基准电压源器件IC1的控制端电压进一步上升直至三极管Q3、Q4完全关断，之后电容C6通过电阻R10放电使得三端基准电压源器件IC1控制端的电压减少，进而退出导通状态，三极管Q3、Q4恢复导通，三极管Q4的导通导致电池电压下降，电容C6出现负电压，进一步减低可控硅IC1的控制电压，导致可控硅IC1完全完全断开，三极管Q3，Q4完全饱和工作，电容C6和电阻R10的正反馈让整个控制电路处于振荡状态，杜绝三极管Q3和三极管Q4工作在放大状态，防止三极管Q4处于放大状态功率过大，烧毁，控制好电容C6和电阻R10的数值，除了保护三极管Q4，还可以让电池在临界充满时，指示灯处于闪烁状态，告诉用户电池即将充满。As an improvement, the secondary charging control unit further includes: a positive feedback oscillating circuit composed of a capacitor C6 and a resistor R10, one end of the capacitor C6 is connected to the positive end of the power supply of the rectification and filtering unit, and the other end is connected to the sampling The connection point of resistors R11 and R12. When the battery is almost fully charged and the charging voltage is close to the control voltage of the three-terminal reference voltage source device IC1, the controlled terminal of the three-terminal reference voltage source device IC1 is gradually turned on, and the base current flowing into the transistor Q3 gradually decreases, and then the transistor Q4 The output current of the battery decreases, and as the battery voltage rises, it charges the capacitor C6 through the resistor R10, and the voltage of the control terminal of the three-terminal reference voltage source device IC1 further rises until the transistors Q3 and Q4 are completely turned off, and then the capacitor C6 is charged through the resistor R10 The discharge reduces the voltage at the control terminal of the three-terminal reference voltage source device IC1, and then exits the conduction state, the transistors Q3 and Q4 resume conduction, the conduction of the transistor Q4 causes the battery voltage to drop, and the negative voltage of the capacitor C6 further reduces the voltage of the thyristor IC1. The control voltage of the silicon controlled rectifier causes the thyristor IC1 to be completely disconnected, the transistors Q3 and Q4 are fully saturated, and the positive feedback of the capacitor C6 and the resistor R10 makes the entire control circuit in an oscillating state, preventing the transistor Q3 and the transistor Q4 from working in an amplified state, preventing Transistor Q4 is in the amplified state, the power is too large, and it burns out. Control the value of capacitor C6 and resistor R10. In addition to protecting the triode Q4, it can also make the indicator light blink when the battery is critically full, telling the user that the battery is about to be full.
尽管结合优选实施方案具体展示和介绍了本实用新型，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本实用新型的精神和范围内，在形式上和细节上可以对本实用新型做出各种变化，均为本实用新型的保护范围。Although the utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the appended claims, changes in form and details may be made. Making various changes to the utility model is within the protection scope of the utility model.
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| CN2011200157870U CN201910653U (en) | 2011-01-15 | 2011-01-15 | Charging circuit of RCC (ringing choke converter) switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199710A (en) * | 2013-04-01 | 2013-07-10 | 上海师范大学 | Low-power consumption standby switching power source |
| CN103647454A (en) * | 2013-12-23 | 2014-03-19 | 无锡隆玛科技股份有限公司 | Self-powered power circuit of photovoltaic system |
| CN105576783A (en) * | 2016-01-21 | 2016-05-11 | 苏州经贸职业技术学院 | Charging circuit |
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2011
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199710A (en) * | 2013-04-01 | 2013-07-10 | 上海师范大学 | Low-power consumption standby switching power source |
| CN103647454A (en) * | 2013-12-23 | 2014-03-19 | 无锡隆玛科技股份有限公司 | Self-powered power circuit of photovoltaic system |
| CN103647454B (en) * | 2013-12-23 | 2016-03-23 | 无锡隆玛科技股份有限公司 | Photovoltaic system self powered supply circuit |
| CN105576783A (en) * | 2016-01-21 | 2016-05-11 | 苏州经贸职业技术学院 | Charging circuit |
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